FPS/power is only a small part of the range and accuracy equation. It is actually easier to make a slower projectile go straight. You wouldn't believe the accuracy you can get out of TM electric pistols at 200 FPS.
Power is irrelevant if you can get a round on target every time you shoot. I play outside with guns shooting around 1 joule (328fps with 0.2g BBs) all the time and never feel at a disadvantage. One notable advantage is that at that power level, you don't have a minimum engagement distance, so you can shoot close range without hurting other players. You don't have to switch weapon or call a freeze/bang bang/whatever. I find that when playing in woodland settings, it is a lot more useful to be able to engage close range than at extremely long range, but then again, that might just be my style of play.
Keep quiet. Sound travels faster than BBs.
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