There's a lot more different than that. Theyre not like the GSXR 600 and 750. The SV's share very few parts, and have much different personalities. The 1000 seems to be the 650's younger, hotter, crazier sister. Lots of fun, until she isn't... Then you remember the 650 cooked dinner, rubbed your back, and had better credit. The 1000 may have been better in the sack, but you're only banging 2% of your relationship (if youre lucky)