Buy a used V1 off of Ebay. Every V1 going back to the very first ones can be upgraded to current spec. The older it is, the more upgrading that will need to be done though. But they will do it! I've seen used V1's going for about the same $$ as a new 8500.
I belive the V1 to be the best unit on the market, but the 8500 is not by any means a bad detector. If there was no V1 we would all love the 8500 and proclaim it the best.
