Buell Blast is a 500cc I was going to get one a few years ago... They look(ed) like a lot of fun... But they're tiny... not just in CCs in actual size.

SV650 would be an excellent choice, But it really depends on what you'd like to do. BMW GS650 are affordable on the used market, and a great upright bike.

I personally drive a Vespa as my DD I sit upright and feet forward... It's just a fun little around towner and for my 3 mile commute to work.

))) I used to have a husqvarna TE570 (((

don't recommend it for street use.