Upgrade Advice PLZ

Hi all, I am looking for my next piece of hardware to upgrade for my GAMING DESKTOP. budget 100-300 (there isnt too many reasonable hardware components out of this range). but im basically looking for the bottleneck (im guessing processor or MoBo)

Rig:
1000W cooler master power supply
Nvidia 790i Tri Sli mother board,
EVGA 460gtx (just bought - woot!)
Intel Core Duo CPU E8400 @3GHz (both of em)
4GB of DDR3 (i believe GSkill 1333)

I just bought BF3 and the processor hits 95-100% constantly (not good?), memory also hits about 75%, but thats not too bad…, but perhaps the mo-bo is really the bottle neck. also, if its possible to have a free solution im all ears.
SUGGESTIONS?? Thanks ahead of time. :smiley:

If I were you I would get a new mobo, CPU, and RAM.

i agree with NumbWarri0r. Mobo, CPU, and RAM. but RAM shouldnt be the highest priority for sure.
if you decide on replacing your processor, this place has a some nice selection of LGA775 sockets.
http://www.eio.com/c-722-cpus-processors.aspx?pagesize=12&sectionids=484&expand=459&ViewType=2

or if youre looking for motherboards, heres a nice list for ya
http://www.eio.com/c-287-motherboards.aspx