I am using a foxconn a74mxk mobo
it uses DDR2 800 667 and 533 RAM
at first I wanted either http://www.newegg.com/Product/Product.aspx?Item=N82E16820220293 or

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145241
they use to be $55 after rebate.... now... a lot higher 


So i did some research and got

http://www.frys.com/product/5530560?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/5226777?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/5611731?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/5672071?site=sr:SEARCH:MAIN_RSLT_PG

and
http://www.frys.com/product/5008315?site=sr:SEARCH:MAIN_RSLT_PG

If you know any other RAM that could be usable by me, then I would love that
Really don't want to spend more than $60 though, cause I am already saving to upgrade this mobo and after that my GPU

The Snake 87 wrote on Nov 15^th, 2009 at 2:42pm:

ya all my mobo( box at least) says it supports DDR2  800 667 and 533
and I thought the first one on frys was good too, also considering my computer stays cool

I don't know what their BIOS looks like, or what kind of things you can tweak with it, but DDR2 is still perfectly acceptable to me! I'm running it, and been driving my girlfriend nuts with how much time I spend messin with it! Here's some specs for mine.

AMD Phenom 9850 AM2+ OC'd @ 2.9GHz HT 3.0 5200 MT/s
8GB Crucial Ballistix DDR2 800 MHz stock running overclocked to processor 930+ MHz @2.05V 4+4+4+12 timings
ATI radeon HD 4870 512MB GDDR5
MSI K9A2 Platinum overvolted & overclocked chipset
Antec 850W PSU
Windows 7 x64

It was a fast machine 1 year ago, and it still is pretty fast, but it doesn't have it's own thoughts like it used to. CPU's  GPU's and RAM is 2x as fast as they used to be.
However, I've been doing a lot of research on RAM speeds and latency timings and such. Turns out, DDR3 timings are fairly loose as compared to the max that DDR2 had. I think before I upgrade to the Phenom2 965, I'll wait to see what the timings for DDR3 get to. You can still build quite a machine with the MoBo you've got, and O/C will help. If you've got a phenom, you can still go up to at least 2.6 GHz (depending on which one you've got, maybe higher) and DDR2 is still really fast. If you O/C and overvolt it, it can still perform as good (maybe even better) than DDR3 with it's current latency bottleneck.
The big item I'm waiting for is the XFX 5870! DX11 and that card will burn the cases of PCs everywhere! WHOOO!!!
All RAM is pretty much the same, as far as brand is concerned. Just look for lower latencies, and go with 1066 if your board supports it, and 800 if not. It's fine, and you can still O/C it. I got a screeny of FSX running a spike up to 209 FPS, and I'm quite happy with it. Hope this helps you out. If you've already finished your build, what did you decide on?