I just got a new 27" iMac to replace my old one, and stuffed it with 40 Gigs of RAM. Lightroom and Photoshop breeze along without all the old delays and occasional crashes I used to have. Now, with a good GPU in my new machine, I'm thinking of Topaz DeNoise and/or Sharpen. I've read many opinions and watched a few vids, and these seem to be highly regarded products. Does anyone here have opinions positive or negative to offer? TIA.