Under $500 (used)...
AT 4047, original GT MD1a, Crowley & Tripp Naked Eye.
under $300 (used)
AKG 451 now and again for bright tones. Rarely, but sometimes perfect. On the other side of the world, I've gotten some really cool sounds with a compressed sm7b. Again, rare usage but sometimes very cool. Been a while since I've used an 81 but remember them being nice on acoustic.