Hi Zack:
You really can't go wrong with any of the bikes you've listed. Others have made some great suggestions to widen your choices as well.
One main thing to consider is what you prefer for engine power delivery characterictics. Inline 4's are gonna want you to wring 'em out, while twins have more grunt all around but aren't as hot blooded. 1-4's typically require more rowing of the gear box to stay in the sweet spot. Your decision on this point will immediately narrow the field.
It sounds like ergonomics are important to you, so I'd recommend you throw a leg over all consdierations and get a test ride if you can. Not sure if you want wind protection.
I'd also say that beyond engine characteritics, suspension should be an important consideration as well. As your skills increase, suspension delinquencies will become more obvious and you'll crave for something that is well sorted. When manufacturers are trying to hit price points, which is the case for many of the models you've listed, suspension is usually the first thing to be compromised. This may not be an issue now, but it might be important down the road.
I bought a naked SV 650 when it came out in 99, before many of the other models that have been discussed on this thread were available. I've added a 1/4 fairing (good wind protection), stainless steel brake lines, sintered brake pads (great braking power and feel), Corbin seat (15K miles and haven't thought of my a$$ once since), and some customer/lower handlebars (improves front end feel). Most importantly, I added stiffer fork springs and Race Tech emulators up front and an Ohlins shock out back. I also added the customary pipe, jet kit and K&N air filter, but while they're good for v-twin music and a little extra grunt, if I had it to do over again, I'd do the suspension first.
I've taken my bike on 2000 mile tours, weekend blasts, mundane errands and track days. For me, it has enough power for the street without getting me into trouble, and has great cornering speed and handling at the track.
For the price difference between the bikes you've listed, you could easily upgrade a stock SV to a bike with higher end componentry superior to the other stock offerings. Food for thought, and once again, you really can't go wrong with any of the bikes listed. Good luck with the dirt to tarmac transition and ride well.