Make the switch, you won't be sorry. Apple will come up with a good program to combine I-Photo & Aperture. Don't know when, but they will, 'cuz there are too many people out there (like us) who need them to do it.
Aperture is a great program & you can continue to use it for a long time. The real problem that I see with it is that as new cameras come to market, the Aperture software won't support it. I am contemplating buying a new Canon 7D Mark 2. Now have a 70D & it does support it.Don't know if I'd be able to edit photos in Aperture from it for a 7D II
If you buy a new Apple, look at their refurbished inventory before you buy a brand new one. I bought a fully loaded 15" retina MacbookPro last year & saved about $500. Apply fully warranties these refurbished products so you needn't worry.
Also--if you have access to an Apple store absolutely pay an extra $100 and buy their ONE-ONE plan. I go to the Apple store (s) near me about 3X/mo for lessons. Can't beat it. Just renewed it today for another year.
Good luck with your decision.

In my experience, the Macs, running on UNIX are much more stable then a similar windows machine.

With no need to worry much about virus, there is no antivirus "suite" taking up CPU ticks and scanning each and every file upon accessing it, there is no disk fragmentation going on every time that I delete a file and empty my trash.

There is no huge registry file that gets corrupted at the drop of a hat then needs cleaned by the next miracle software package at a cost of 29.95

When I wish to "uninstall" a software package, I go to the applications folder and delete it.... with windows, how many times are traces of software left forever in the registry?

For me, the BIG difference is that when I was in the PC world, about every 12-18 months I was looking to upgrade because my computer was running slow - of course I would run the defragmentation software, the speed up software, tried all the tricks - even reloading everything from scratch so as to have a pristine system, but still 18 months and it was time for a new machine - with Apple, my 8 year old IMac my wife now uses is running as fast as it did day one.

The only reason I upgraded after 7 years was I wanted a 27" screen instead of a 22" screen.

So, perhaps it is NOT what it can do that a PC cannot, it is more what it does not get that a PC does...mainly slower and more bloated as time goes on.

Higher price? Yes, there is an "Apple Tax"... but considering the equipment lasts much longer is it really expensive? As I said, I used to replace PC's every 18 months or so, now, I can go many years without a need to replace.

I also believe that unless you buy a "custom" built PC these days, AND pay a much higher price for it, you are simply getting whatever parts the MFG could purchase at cheap prices to put in it, at least with Apple the machines are put together really well in my opinion.

Now, of course, just because someone runs a PC does not mean they are stuck with Windows... LINUX provides much of the same, and is FREE, but I found that I still prefer the Mac and gave up using LINUX as well.