It's pretty upright, a cross between a tourer and a sport bike. Lately, sportbikes have you completely crouched down, and most of your weight rests either on your arms, or your legs are doing most of the support.
In 95 model yzf600r is different than the 96-2007
1995
96-2007
As long as the pricing is negotiable, 2000-2200 is a fair price if it has low mileage. Keep in mind, they were 7k brand new msrp, and i bought my 2000 in 2005 (5 years old) for 2,800 with about 16k miles.
Things to check out are the drive chain (should be replaced every 10k miles, along with sprockets). Check for excessive wear, and how worn the sprocket teeth are. Those yzf600rs are known for 2nd gear synchros occasionally going out, so find out if any of those issues were experienced. Also, if it has a difficult time going from 2nd to 1st, change weight of the oil, it helps. I think I was running 15w50 in mine and it made it run smoother.
Ergonomics are decent, but the stock seat is pretty crappy and soft. After 30 minutes of continuous riding, it'll sag and your butt won't be too happy.
Also, ask to see the bike cold, so you can fire it up and warm it up. You'll probably need to keep the choke on for a little bit. If it has an exhaust, and has a difficult time firing up or running smooth, jets haven't been adjusted to compensate for the exhaust. Look at engine side covers to check if it's been dropped - those are the first parts to touch the ground - vertical scratches mean it was dropped from stand still, horizontal means they were dropped at speed.
Aside from that, very solid and dependable bike. I would get 50-55mpg average on highway out of mine without doing anything stupid. 40 or so if I was having fun or mixed riding