Jeff,
If you are wanting good BANG for your buck, consider the ZDZ 80 single! It's only a couple ounces heavier than their single--I believe it uses the same case, because its' got the same stroke. (Dick, is this true?) On the other hand, it outpulls some 100's. Now that's a lot of BANG, for only 5-600 bucks.
Cliff
http://www.rcfaq.com