New PC time been 3 years since i upgraded Options

[Peeka]

Whats good these days i dont have a huge budget would like to keep it under $1000
current spec is

Processor: AMD Athlon™ 64 Processor 3800+, ~2.4GHz
Memory: 2048MB DDR2
Hard Drive: 74 GB Raptor
Video Card: NVIDIA GeForce 7800 GTX

dunno whats good these days ie bang for buck

AMD or Intel
ATI or nvidia

do i need to upgrade gfx card or will current one be ok for now till i get extra cash later
also need a new case with psu as this one is fubar
dont need hdd's

was aiming at intel Dual Core and nvidia cause there pritty much idiot proof and cbf stuffing around but amd and ati have seem to come a long way so dont mind giving them a try again