im in the same boat as Furball.. well , kind of. i have an '02 R6 i bought new, and have about 17,000 miles on it now. i have done ur basic mods to the R6 (exhuast, 15/50 sprokets, 520 chain, ignition, ect) and even though its fun as hell inthe twisties and imo, fast as hell, my buddy let me borrow his busa for the weekend (he lives in an apt complex and wanted 2 keep it at my house/in the garage, so he said i can ride it whiel hes gone 4 watching it) anywho, ive wanted a busa 4 ever and after riding it, im going 2 sell the R6. it was SO comfortable (rode like a caddy imo) plus me being 6'3" 200lbs, the busa was alot more comfortable 2 ride around in. only thing i "didnt" like was the turning on the busa seems so... horrible.. vs my R6. but then again.. a R6's size vs a busa's size. after only 7 months of riding i wouldnt "upgrade" yet. learn 2 ride tha 600, ud b surprised what it can do... i was always told "u'll never outride a 600" and after many track days and trail runs, im still amazed at what it can do and i know i can take it further...