I'm in a slightly different position than what most of you seem to be in. I don't have half a dozen different keyboards and follow knowledge threads about 20 others. I'm basically about very few ergo items (all in my sig), and the major modification of 2-3 items. I don't need to justify to coworkers or family, but I show a few friends and dates. The unique looks of the Kinesis Contoured/Datahand/Rollermouse/Alphagrip are always primary, and the 2 modification units are secondary. I did buy about 10 Kinesis Contoured thinking I would modify each one differently to see what worked best, but later realized I can mod only 2 with all the mods (as I slowly sell off the herd).
Oddly, most of my dates seem to really dig it, or maybe it's just another thingy on the list....