Standards are the bikes like Gonzo's Brutale, with a more relaxed seat, lower and more forward pegs (usually), and upright handlebars instead of clip-ons. Typically they're all cheaper than a supersport simply due to a lower demand, so that's a plus.
Coming from your Harley, you'd probably be good for any type of power. In the states, they're usually a bit harder to find, but they can still be had. The ones I'd recommend are:
-Suzuki SV650: there's different variants, but the regular (non S/SF) is a good naked bike. Has a v-twin for torque.
-Honda Hornet (599 or 919): a great inline-4 bike. My buddy had the 599 and I loved it. In the states, the 919 is fuel-injected while the 599 (which they stopped in 2006 here) is only carbed.
-Triumph Street/Speed Triple: probably a little more expensive than the others. All you need to do is ask literally anyone in this thread and you'll see why they love it.
-Suzuki GS500/Kawasaki Ninja 500: a lower power (but great fuel economy) option. I had a GS500 and it was great as a first bike but I wouldn't want to putt around on highways for a long time on it.
-Kawasaki ZRX1100/1200R: My bike. Torque for miles, but comfortable. I paid $2200 for my 2000 1100, but they're typically a bit more than that (around 3 grand for most).
-Yamaha FZ1/FZ6/FZ8/FZ-09: Never ridden these but a lot of people praise them, especially the FZ1. The 09 is newer, so it's not cheap yet, but I know when I was searching for a Hornet, I ran across some FZ6s and FZ1s for less than 4 grand.
-BMW F800R: Honestly, can't say much about these in terms of performance or comfort, but I know they look damn great. It's got a parallel twin, not a boxer like some other Beemers but you might have a hard time finding a used one.
If you want to compare the seating position on any of these, I'd use this site:
http://cycle-ergo.com/