Memory upgrade

Hey guys, a very quick question regarding my RAM

I've recently decided i'm gonna upgrade to a comfortable 8GB of RAM for my more memory hungry applications and to speed up the rendering process.

I currently have a 4gb kit of Corsair (DDR3 1600MHz/PC3-12800 XMS3 Dominator Memory CL9 (9-9-9-24)).

I'm looking for something a little more low profile to fit under my coolermaster v6 cpu cooler as the heatsink fins on the dominator memory kind of get in the way.

Am i alright to get different memory, and if so what do i need to take into consideration when matching it with my old kit?

What is you rig specs and what exactly RAM kit you have right now ?

It is also worth thinking about Which OS you will be running on the computer.

Remember that you will have to be running a 64Bit OS for it to see all the ram :)

Rig specs is as follows:

Windows 7 64bit
Asrock 880g extreme3
AMD PhenomII x6 1055t (clock speeds for now)
MSI FrozrII GTX 580 OC
4gb Corsair Dominator 1600mhz 9-9-9-24 DDR3
OCZ 1000w power suppl (Soon to be corsair 750wHX)

Think thats all you need? I'm simply looking for some more low profile memory so i can fit it under the monstrous cpu cooler

You could use some Corsair 2x4GB XMS3 2000MHz, it's low profile without extra protruded heatsink.