I shoot landscape almost exclusively, and currently use a 17-55mm f/2.8 and an 80-200mm f/2.8. I upgraded to the 17-55 from a Nikon 12-24mm/18-70mm combo as I wasn't happy with the 12-24 (it was sharp, but I didn't like the color rendition or drawing) and wanted 2.8 in the wide-short tele range for the rare wedding job and to make manual focusing easier. The issue I have with the 17-55mm is the weight. I don't carry my camera around every day anymore because it's too heavy. Optically I have nothing to complain about. I'd like to replace the 17-55 with some primes, but I don't want to loose image quality in the process. I'm mostly concerned with performance from f/5.6-f/16. I'm ok with manual focus on the wide angle, but I'd prefer auto for the standard and short tele focal lengths for other work. I'm using a D200 body currently, and don't see myself upgrading to anything else for a few years. I'm currently thinking - 20mm f/2.8 AIS - seems to have the least amount of CA issues while maintaining sharpness 35mm f/2 - I've read it's better then the f/1.8 when stopped down 50mm f/1.4 Would I be giving anything up IQ wise with this trio? Are there better options for my requirements?