Best RAM for Asus P5Q Pro and Q9450?

I'm down to figuring out suitable RAM for my new system. I'm not a gamer and don't know if I'll be OCing much. I may be open to it, but my first consideration is a quiet system which is my case is an Antec 182P, fanless GPU, Xigmatek HDT-S1283 heatsink, and Q9450 CPU (runs cooler than 65 nm) and samsung hard drives.

I may be open to OC, and have to read more, but not at the cost of generating a lot of heat, creating system instabilily, taking a long time to learn which ones, tweak and test zillions of BIOS settings, or shortening system life--I'll probably keep this system for several years.

I [U][B]am [/B][/U]open to suggestions, but presently am thinking of the follow RAM:

CORSAIR XMS 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
5-5-5-18
1.9v
http://www.newegg.com/Product/Prod [...] 6820145184

$45 AR or $90 for what I need (8 GB)

and

Crucial Ballistix 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
http://www.newegg.com/Product/Prod [...] 6820148212
4-4-4-12
2.0V
$56 AR or $112 for what I need 8 GB
(futureproofing or overkill?)

What difference does stock voltage have? I would assume that higher voltage runs faster and generates more heat and would shorten RAM life My work is Photoshop and Lightroom, and general computing. For what I need, would the RAM make much difference and if I'm not looking to do water cooling style OCing? I know that this, and other 45nm CPUs, having somewhat limited OCing ability due to their multiplier.

Money is somewhat tight with a fat Calif mortgage and 2 kids in child care.

What makes sense and why?

Thanks!

Reid

I always buy RAM that will operate at its advertised timings on the JEDEC standard 1.8V.
At the low end, I've used A-Data, like this set for $60: http://www.newegg.com/Product/Prod [...] 6820211188
My preference, however, is Mushkin, like these for $55 after $20 MIR: http://www.newegg.com/Product/Prod [...] 6820146731
RAM that needs more voltage to achieve its claimed timings will run a little hotter at that voltage (which you will need to manually reset after any BIOS reset), or will be a little slower when run on only 1.8V, like 7-7-7-18.

The mushkin should obviously run faster,but I personally recommend G. Skill.

However,due to an issue in where I bought my Corsair,G. Skill was not available.