Suggest not getting LA series, they have bushings rather than ball-bearings. Reliable enough, but can make an obnoxious knocking sound (crankshaft is designed to travel back and forth to promote lubrication of bushing).

The OS FX and TT Pro series are excellent choices (ball bearing support crankshaft). I have the TTPro 46 on my Avistar. Very happy with it. Runs quite smoothly. Costs less than OS FX - same quality - and I really like the slanted needle valve arrangement.

MrJB