I have NIK which 3 is included in Corel PSP 4X, 5X tho 4 is current. So with PSP X5 "Ultimate" at the $50 sale mark, it is worth while to buy it for its self and NIK (also face make over and other plugins). Topaz 40% off sale ends midnight 12/31. Code to put in the code box is ... Topaz2012 .... Based on that price I would go with the full bundle. If price is an issue get B&W if you do B&W and the best of all the Adjust 5. $50 but at 40% off just $30!!. Topaz also, thus far, has upgraded for free where as the other plugin/preset packages cost to up grade. Topaz also has a stand alone in which all are in one package and intigrated for easy working... also topaz has a lazy mans un-mask program... and great "edge aware" (mask and brushes) sloppy work, unsteady hand, end result is great.
I have watched many Topaz Webinars both on line and archived (see resources at the
www.topazlabs.com site). I watched only on-one and it was not well done... unfair sample... rest may be great.
Could be that I like Topaz best simply because I have used Topaz the most. Surly all are good for particular operations and results. Me, I like over sharpened detail and saturated surreal look, not saying that is the stock and trade of Topaz... simply that which of these "plugin/preset" packages is best is probably a tossup, and thus a moot question. Assuming that they are all about the same then go for price and upgrade price history.
If every one in your photo club uses a particular one, then go for that because of the buddy help availability. Me, I am considered impure because I use Topaz and PSP and go to an Adobe Church Purist Camera Club filled with expensive DSLRs.
Even tho not conforming to the club norms, I won 3 place (year long competition) in the non-pro division in 2011 and got booted up to Pro class, because of high points, at the end of 1 quarter of 2012. I did that with a 7 YO P&S pan TZ3 and PSP and Topaz. So, in a sense, I did not win, the Post Processing combo won by taking my mediocre photos and working magic. That comment is reality and not humility.
I have NIK which 3 is included in Corel PSP 4X, 5X... (