ok my final decision is this videocard
Newegg.com - XFX HD-575X-ZNFC Radeon HD 5750 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card - Desktop Graphics / Video Cards
and this power supply, is that good?
BFG Tech GS-550 550W ATX12V V2.2 / EPS12V V2.8 SLI Ready CrossFire Ready Power Supply - Retail
Free card reader w/ purchase, limited offer
EDIT- I read that a few people had problems with the ATI drivers on the 5750, that worries me a bit