What's wrong with what you have? Limiting an overclock or something? Mushkin always gets my vote, followed by Corsair. I'd probably buy another 4 gigs of the same. But it really depends on your need/desire.
P.S. Maritimes represent!
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fiat justitia ruat caelum
I've had 500fsb stable on my q9450 but I have a gem of a CPU, and it required too much vcore which produced too much heat for my air setup (tripped PROCHOT with IntelBurnTest).
Even with water you probably won't be running 500+ 24/7.
Here's the thing though, I get higher clocks on my Asus p5q-e + q9450 using a 5:6 divider at the 333mhz strap than I do 1:1 @ 333 so in order to get 3.7-3.8ghz (my 24/7) at performance level 8, my Mushkin DDR2-1066 Ascents run at 1116mhz. The headroom can be handy so if you're getting new memory anyway why not get the fastest you can with decent value (1066-1100 imho) and use the 1000mhz stuff as backup? Unless you're tight on cash or want to save for whatever reasons.