Budget PC build under $450

I am looking for advice on a desktop build for $1000 since my current laptop can no longer keep up with modern technology.

Current specs:
Intel Core i3-2350M CPU @ 2.30Ghz
4,00 GB RAM
64-bit OS
Ati Radeon 7670 M 1 gb
500 GB HDD

I would appreciate it if someone could put together a build that offers slightly better performance than this laptop for $1000, if possible. Ideally, I want something with room for future upgrades—meaning a decent motherboard. I am a novice here, so I am relying on you all to provide a solution. =D

Thanks in advance.

The Samsung SH-224DB sat Bulk Black optical drive.
Transcend DDR3 4GB 1333MHz, JM1333KLH-4G, bulk
The ASRock FM2A88M EXTREME4 + Chicony Active 400 w ATX motherboard.
The Chicony Active 400W ATX PSU, specifically the CHI-HPA-400W model.
Toshiba DT01ACA050 500
The MS PLUTOS case, just the chassis without the power supply.
The XFX AMD Radeon R7 260 x Graphic card with 1GB of DDR5—specifically the XFX-R7-260X-ZNF4 model.
I guess I'm looking at the AMD Athlon ii x4 760 k sveukupno.

Total: $2,999.81 center.com

+$27 Shipping... I guess.

If your CPU cooler starts getting a bit too noisy, you might want to pick this up at Links:

Found this cooler over at Links. It looks like it might work, I guess.

Yeah, 2GB sounds reasonable. I'm thinking it won't be a huge deal if I just toss in a single 4GB stick of RAM. It pushes me slightly over budget, but I'll make it work. Ordering next week—thanks a ton!

EDIT: You could probably get away with 8GB too.