i'm running Lifeguard "Quiet One" (old, brown x2. new ones are blue) on my tank. no problems so far. pretty quiet, they add a little heat to tank. as for powerheads/circulation, i use rio's older, purchased used. frustrating part about the rio's is when the power goes out, they sometimes need help in restarting, which may include removal from tank, and minor disassembly.
i don't have any experience w/ other p/heads.