I would stick with the 3-Pro if only because the 800W RMS of the pf800 could potentially blow out the speakers in the 410hlf. You'd have to have it pretty loud, but still. I run a 3-Pro/410hlf rig, and they seem like they're made for each other. Plenty of volume--never gone past noon on the master. Gained up, you can get a very nice growl out of it. Plus, the tightness of the 3-Pro offsets some of the looseness of the ported cab. I think my wife paid around $500 for mine (best Christmas present ever!), maybe a little more. If you do choose the 3-Pro, I'd budget another $75 or so for new tubes, especially if its loaded with cheap Sovteks. Speaking from personal experience, its a night and day difference.