I have on Q9550 an ZEROtherm ZEN FZ120 is a very good cooler.And is not expensive.
Another good cooler is Zerotherm Nirvana
If you can fit it in your case, the Noctua NH-U12P SE2 Dual Fan Quiet CPU Cooler is tbh, an absolute defeater. Sooo quiet, really powerful, currently keeping my core-i920 that's heavily overclocked cool and literally makes no noise doing so.
Also looks pretty good if you've a windowed case - it is a monster
i have a Thermaltake Spedo case and i have the extra passive coolers addded to the mosfet and northbridge, so i also want to know if there'd be any clearance issues