chapjohn Loc: Tigard, Oregon

I would get Sony G or GM lenses.

orrie smith Loc: Kansas

I actually own a Nikon 200-500. As to the teleconverter, they soften the images too much for my preference and I would only use one in extreme circumstance. If you do consider the Sigma 150-600, I have been told the Sport model is the best one to consider.

TriX Loc: Raleigh, NC

Almost! But if the price puts you off, consider a 5D Mk3, which will likely drop some in price when the MK 4 is introduced (supposedly) this month.

cjc2 Loc: Hellertown PA

I own the Sigma 150-600 Sport. I would and do not use it with a TC because it would just be too slow for any of my purposes which would slow down, or stop, autofocus operation. It is a decent lens, but not a fantastic one. I bought mine for BIF.

O2Ra

I'm a Nikon guy like some of the others and not real sure about Canon prices but know some lenses that should be in the ballpark for you.
Seriously consider the Tamron 15-30 for your wide stuff it has f/2.8 and imagestabilization. The phenomenal 11-24 f/4 canon is 3k.
Then you may want a midrange prime or Zoom that's fast. The 70-200 f/2.8 is stabilized get a used or refurbished one . Can't beat that lens and with the $$ you save getting the Tamron 15-30 you could add it to the canon 70-200 f/2.8 is and buy new.
Then on the long end I know Canon makes a great 300 f/4 not sure if it's stabilized but you shouldn't need that for sports and they are super super great for portraits. The Sigma 150-600 Sport is 2k and tough as nails also either canon 100-400 are great. Don't know their specifics but have only heard great things about them. Really consider a 300 f/4 . It's a way more useful lens than folks give it credit for. I have a Nikon one and just shot football with it last night. Used a 1.4 tc when the light was good in crop mode on my d810. Even cropping some of the pics the resolution was phenomenal. Good luck

boberic Loc: Quiet Corner, Connecticut. Ex long Islander

16-35 2.8 II 70-200 2.8L 100-400 L II all IS. that should cover everything. As far as full frame is concerned---since you wwant to do sports- go with the 7d2. but if you must go full frame--wait for the 5D mk4 is released and the 5D3 will sell at a bargain.

cjc2 Loc: Hellertown PA

Really?? For a Canon camera! Please READ before you reply! Geesus!

O2Ra

Great advise

47greyfox Loc: on the edge of the Colorado front range

Couldn't agree more. I have the same combination of bodies and lenses except for the 100-400mm. Instead, I have a 70-200 F/4L + 1.4 teleconverter. And for fun, a Sigma 150-600 Contemporary. Also, living the dream for 5D4 but proceeding carefully on that one. :-)

rmorrison1116 Loc: Near Valley Forge, Pennsylvania

That's an interesting question. With only 3 lenses to choose, I'd try to cover the broadest range possible and look for good used lenses to stretch the bucks as much as possible.

EF 11-24 f/4L used
EF 28-300 f/3.5-5.6L IS used
Sigma 150-600 Sport
Sigma 1.4 TC 1401

I got a good deal on the used lenses so I got the teleconverter designed for the Sigma zoom.
This selection will cover from 11 to 840 mm.

Body's, you didn't put a cap on body price so my choice(s) would be:

EOS 5DSr for most anything that's not in a hurry.
EOS 1DX II for everything else.

Of this list I have 2 of the lenses, the teleconverter and one of the body's.

jim quist Loc: Missouri

The focus wont be as sharp

this should help you out on which lenses you can use with the extenders
http://www.wexphotographic.com/blog/canon-teleconverter-compatibility-chart

Architect1776 Loc: In my mind

10 -18, 24 -105, 100 - 400mm. All IS and the cheap price of the superb 10-18 allows for the other 2 superb lenses. I have and use all 3 of these lenses and have no regrets at all. I do have a couple of specialized lenses but I could easily live with just these 3. The 10 - 400mm focuses so close at 400mm it is almost like a macro lens compared to all other makes and models of telephoto and telephoto zoom lenses made including the Canon 70 - 200mm f2.8 which the 100 - 400mm covers and doubles and is great on your 7DmII. Just a super versatile lens. The 24 - 105mm is an excellent walk around lens with the 105mm range can reach out quite a bit more than a 70 can hope to do. And the 10 - 18 is just plain incredible. sharp and wide what a combination.
You asked and I answered.

jeep_daddy Loc: Prescott AZ

16-35mm
24-70mm
70-200mm

MT Shooter Loc: Montana

Tamron 15-30mm F2.8 VC
Tamron 24-70mm F2.8 VC
Tamron 70-200mm F2.8 VC
$4000 for all 3, they are all fully stabilized, they have the best warranty out there at 6 years. And yes, I shoot them all, great set of lenses.
For longer I have the Sigma 150-600mm Sport because it's weather sealed, but the Tamron 150-600 is a great alternative at half the price.

Are you ALWAYS going to be limited to a crop sensor body? Remember that Canon crop sensor lenses will not even mount on Canon full frame bodies. Also, Canon lenses only come with a one year warranty, worst in the industry.

Good luck in your decisions.

cambriaman Loc: Central CA Coast

I'm right on this with Mac. I do have a Nikon 16-36mm as well though.