I don't have a boat YET, but I can probably answer a couple of questions from just reading and sending PM's to people.
All of the boats perform about the same. The Taipans have a tendancy to have a really good life span of competitiveness. 10 year old boats that will win National titles and still beating the newer and more buoyant boats like the Blades. Blades are a newer boat with a little more buoyancy as previously mentioned and a few upgrades. You can do a search here...
http://www.catsailor.com/forums/search.php?Cat=0 to get a little more information.
The F16 fleet seems to be building, there are 2 or 3 out of the Chattanooga area, one in Birmingham Alabama, I believe a couple in the North and South Carolina area, one in Little Rock Arkansas, and if everything goes according to plan, I will be one in Memphis TN in the spring. I'm looking to get a new Viper, again if everything goes according to my plans.
8,000 sounds doable, but I would think closer to 8 rather than below eight. That would be more likely some of the Taipans out there right now for sale like here...
http://www.catsailor.com/cs_classifieds.html Rick has one for sale still at the bottom of the Classifieds for about 8500 or 9000, can't really remember, but that wouldn't be too far off of your price range.
I'm looking at new, just because. No really good reasons to be honest. I'll be the guy with the new boat and bringing up the rear.
Mike