Need help to build a little rig.

[TwiiKuu]

Hello there.
I discovered Bitcoin about a week ago, I'm not really into it. I started minning with my old ATI, and I've got B0,01 out of it, I was fairly proud. I wanted to make more profit. And I decided to buy component to build a rig! I made myself a little list, don't ask me where to get the stuff I found, they're on a french discount site called "CDiscount.com". I want you guys to analyse it, tell me what's wrong (Missing components? Useless ones?), tell me what's right or stuff more profitable (as long as I can buy it and ship it to France).

Proc: AMD Sempron 140 for 29.98.
Motherboard: Asus M4A79XTD EVO for 85.99€.
GPU: 2* Sapphire Radeon ATI HD5830 1Go Extrem for 2*86.99€, total of 173.98€.
Alimentation: Need help thar. Any ideas?
RAM: Kingston KHX1333C9D3K2/2G for 25.99€.

All of this makes a total of 386,09€ without the tower and the proc. I'll get a 20% thingie, with makes the price lower to 308.87€.

I expect about 270*2MHash/second, 300*2MHash/second if I OC, I guess.

I hope you'll help me out, I might send BTCs to good helpers.

Edit 1: changed Proc & Alimentation

[kokojie]

Sempron 140 good enough for CPU, no need to go for the more expensive athlon 250
PSU 500W is simply not going to work, you'll need minimum 650W PSU, and you should probably get more in case you want to add more cards to your rig later

you should get even more than 240MH/s with 5830, probably to the tune of 300MH/s once OCed

[muyoso]

I get 305Mhash/s out of my Sapphire 5830.  Overclocked of course.

[TwiiKuu]

Sempron 140 good enough for CPU, no need to go for the more expensive athlon 250
PSU 500W is simply not going to work, you'll need minimum 650W PSU, and you should probably get more in case you want to add more cards to your rig later

you should get even more than 240MH/s with 5830, probably to the tune of 300MH/s once OCed

I can't get to find a Sempron 140 on the website, I lurked pretty bad there :/. I'll take a look again.
Any suggestion on the Alimentation?
Thanks for the help, sir.