the GPU is not an option, i've to get that one!
ok if i have to upgrade CPU too. how is this one
Intel® Core™ i3-540 @ 3.06http://ark.intel.com/products/46473/Intel-Core-i3-540-Processor-%284M-Cache-3_06-GHz%29
and suggest me any motherboard under $60, if the above are not good enough
btw i use my pc for 3D app like maya, mudbox and gaming is a plus.
ps. i have a DDR2 RAM and this motherboards say "Memory Standard: DDR3 1333/1066" is that a problem