Add a vote to the reco to think larger dual sport. The Suzuki 400 and Kawasaki KLR 650 are fantastic bikes, especially for taller folks. They handle almost like sport bikes, but are way more forgiving. The KLR in particular is also a great used bike value (because it’s been in production so long). I ride a 1000cc sport tourer, but if I had room for a 2nd bike, it would be a Suzuk 400 or KLR 650 — these are seriously fun bikes.
If you want strictly sport, you might check out the Buell Blast, Suzuki GS500 or the ubiquitous Ninja 500. If you want an older used bike, Yamaha Seca (600cc) is an awesome older bike with power similar to the SV650 (in fact, it’s more sedate).
Agree with you on the SV650 — they are such great bikes that sellers think they should hold their value like they were a Harley. HAHA