MB/CPU/RAM on a budget

I've been doing a lot of research since I last built a system, since then I've gotten overwhelmed with all the information that is out there as far as Motherboard/CPU/RAM compatibilities, RAM Speeds, CPU Support, etc.
My inquiry though, is if any combination of these would in fact be compatible, stable, and would allow for future upgrades.

CPU-AMD Athlon 64 X2 5000 Brisbane 2.6Ghz 65W AM2 socket

MB- ASUS M4A79 Deluxe 790Fx AM2/AM2+ or ASUS Crosshair II Formula nvidia 780a AM2/AM2+

RAM - Crucial Ballistix Tracer 2x1GB (Either DDR2 800 or DDR2 1066)

I know that the processor I'm wanting to use is relatively out of date, but I'm on somewhat of a budget right now, and my biggest issue is the compatibility. Either way, all of this would be an upgrade (as im still using a 939 socket). If I could have either a little guidance on which of these would work, or if someone could point me in the right direction, i would be very appreciative.

get 4GB(2x2GB) of memory, the motherboard you picked out isnt really budget

i would get something like this, closer to budget but still a good board
ASUS M4A78-E 790GX
http://www.newegg.com/Product/Prod [...] 6813131368

The motherboard is something I'm not too concerned with price on.....because its the one thing i dont want to have to upgrade for a long time. thats why im settling for a lower processor for now, because eventually, id like to work up to the Phenom II X4 940. Basically, i dont mind getting lower-end RAM or a low-end processor for now, as long as the motherboard can take bigger and better stuff later on.