The RV's are great planes. I would definately hunt out someone in your area for a ride. Most RVers are happy to drag another poor sole into ther addition.
You'll have many choices at the 100k range. Other things to consider that influence price are avionics, engine and p&i. If you don't want IFR, you'll save a bundle. If you don't want max performance, you can save some on a FI engine w/ fixed pitch prop (can't say that this setup is not performant after flying piper/cessnas). Otherwise, find the best bang for the buck.
The 7A is Vans newer side-by side model. It's wings are about 6" longer on either side and it's rudder is larger than the 6A. I'd assume this'd help it be a little more stable and controlable (still not a very stable platform... not supposed to be

Also, the 7A is pre-punched, so I'd assume the workmanship would be better on average.
Another consideration is the 9A platform. It's wings are designed more for cruising than sport flying. Also, max engine is 180hp. If you want to do light aerobatics, I'd discount this model. Otherwise, it's typically configured to be a little more efficient platform for x/c.
If you got the bucks, want to do some loops and roles now and again, the 7A is hard to beat. You can get a great deal on a 6A. Fantastic plane for the price. However, all of them are fantastic planes.
The rest is just goodies... avionics, engine, p&I...
Another note, get an experinced RV builder, preferabley an IA even an EAA tech counselor to inspect the plane before you buy it. They'll see a lot of things that you'd miss. They'll see a lot of things that even a typical IA would miss simply because they know the planes well.
I would not get too hung up on how many planes the person has built before. Many first time builders are *very* anal and will continue to re-do the work until it's just right. Conversely, some repeat offenders are not anal and like to crank out a plane and don't sweat the details. And visa-versa. Just get an experienced RV builder to check it out for you.
Where are you located. Maybe someone in the area would chime in and volenteer to give you your first dose... er, ride
