Cheap build mostly for web surfing

I am looking to built a cheap computer mostly for web surfing and basic tasks. I want it to be fast though. My current computer is starting to take forever on startup and has trouble handling websites with a lot of multimedia, and I have a very impatient husband who is frustrated with it. He goes to a lot of websites like Gamespot and IGN to watch videos and things, and there's usually so much going on that the pages take forever to load or freeze and won't do what he wants them to do. I need a new cpu, mobo, ram and gpu. I have everything else, although my power supply is only 350W and about 4 years old, so that may need to be replaced too. I don't care about AMD or Intel, although it seems like AMD might be better on a budget. I don't want to mess around with overclocking. I don't planning on using it for gaming, but if it's not too much, I wouldn't mind having a system that's capable of playing games decently. I don't really have a set budget, but I'm hoping somewhere around $300, probably no more than $500.

Processor AMD Phenom II X3 720 BE
(2.8GHzx3, 3x512KB L2, 6MB L3 Cache) $145
Cooling AMD Retail HSF -
ATI Radeon HD 4670 $70
Motherboard Biostar TForce TA790GX A2+ $110
Memory 4GB (2x2GB) DDR2-1066 Patriot Extreme Performance PDC24G8500ELKR2 5-5-5-15 (after $25 Rebate) $39
Audio On-Board 8-channel HD Audio -
Power Supply BFG Tech LS Series LS-550 550W SLI/CrossFire 80 PLUS Certified $80

Total $444.00

I suggest replacing the power supply. Your's is old.

Thanks for the input. I had been leaning toward AMD, but a lot of people seem to like the E5200 and it's cheaper than I expected, so maybe I will go that route.

For your purposes, I would get a motherboard with integrated video and skip the video card. And since you are skipping the video card, I bet your old 350W power supply will work just fine. You can always get a new power supply and video card later if the integrated solution doesn't suit you.

Any standard ATX power supply should fit the Antec case.

Ok, so I think I'm getting ready to order. How does this look?

Intel Pentium E5200 Wolfdale 2.5GHz 2MB L2 Cache LGA 775 65W Dual-Core Processor - $69.99
http://www.newegg.com/Product/Prod [...] 6819116072

G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory - $44.99
http://www.newegg.com/Product/Prod [...] 6820231226

ASUS P5QL PRO LGA 775 Intel P43 ATX Intel Motherboard - $86.99
http://www.newegg.com/Product/Prod [...] 6813131329

HIS Hightech H467QT512P Radeon HD 4670 IceQ Turbo 512MB 128-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - 69.99 AR
http://www.newegg.com/Product/Prod [...] 6814161252

Antec earthwatts EA500 500W Continuous Power ATX12V v2.0 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC Power Supply - $49.99 at my local Fry's
http://www.newegg.com/Product/Prod [...] 6817371007

I went with the ASUS mobo over the Gigabyte one that was suggested because it looks like there is more space for the video card, and the one I chose has a large cooler and takes up two spaces. I'm basing this off the pictures of the boards, so I could be wrong. I'm not really sure which would be better, they look very similar to me. The video card is probably more that I need, but it seems like a very good deal. Same with the power supply.

I am re-using my case, hdd and optical drives as stated earlier in the thread. The case is an old Antec. I don't know what model.