In reply to RCJ:
I've had a 1999 Sv650s since september now and it's brilliant, It's my first big bike and it has the restrictor on (I'm under 21), still has ample power though and the engine is lovely. It's very light and handles well.
There are probably more comfortable equivalents out there, the seat is low and pegs are high, (unless you go for the naked version which has higher bars) which can cause some discomfort in the legs after a while. Still, I rode to Cornwall last week on it from Birmingham and it was comfortable enough with a couple of stops.
My brother has the bandit 600 (1997). He would rate it as much as I rate my sv. Really solid engine, more comfortable and slightly taller. Similar power and quality of finish on both sv and bandit (which is perhaps not the best... have had minor problems with electrics and the exhaust systems corrode in a matter of days!).
Either would be a great choice, though each one suits different priorities; Sv more sporty riding position and better handling, bandit more comfortable, bigger and heavier with a higher revving engine.