Personally I'd go with a promaster, probably because I own one though.. The profile is nicer, and I can attest to right around 20bps (never chrono tested it so I'm not sure) right out of the box..
Everybodiesguy: Go with a Promaster/B2K4. (Looks like you did according to your sig.)
matrix_agent: Stock B2K4 is capable is 36 ideally, around 23 with stock internals.
LFboarder: I'm gonna call shens on the 17 bps thing, the Apache only feeds around 16/15.5 avg. So that means it goes sometimes faster, sometimes slower, so it would chop w/ 17 bps. I did the test four times, with two quantities of paint. It fed 150 balls at 16bps avg. and 100 balls at 15.5bps avg.
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Play - [B2K4] - [Profiler] - [68/45] - [Evil Gear] - [Reloader] - Ball Rate My Bushy!