I read through all the posts and no one mentioned my personal favorite used bike... the Honda Superhawk 996... so I thought I would put in my 2 cents!
I feel like you do about wanting that low end torque but still wanting the sport bike look... plus, I dont want to drop $6-7000 on a bike right now like the SV650S will cost me. The Superhawk has the same semi-naked bike look, a 996cc 2 cylinder engine, tons of torque, awesome handling and light weight. Best part for me is that I can get a 1998 model for around $4000 and it looks identical to the brand new 2004... they havent changed the styling. Plus, since it is not very popular with the biker boyz crowd, the owners tend to be more mature, older guys who take good care of the bikes, dont abuse them, dont do wheelies, garage kept. And, finally, there are tons of aftermarket parts for it, including lower fairings to give it the full sportbike look.