Kaian,

Good to hear that you're enjoying the GP 4000's. I'll keep them in mind when it's time to replace my tires. I had a set of GP's (not 3000's or 4000's) and didn't care for them. They felt much heavier than the stock Bontragers.

I have a set of Schwalbe Stelvios on my bike and have been absolutely thrilled with them. To me they feel light & responsive and they haven't required the use of my Road Morph frame pump while on a ride. (I type that last phrase with much trepidation -- I really hope I haven't jinxed myself.)

Just in case someone else comes looking, it sounds like TE folks have had good experiences with the following 650C tires (in no particular order):

Continental Grand Prix 3000
Continental Grand Prix 4000
Kenda Kaliente
Michelin Axial Pro
Michelin Pro Race
Panaracer Stradius Sport
Schwalbe Stelvio

-- Melissa