Is this http://www.newegg.com/Product/Product.aspx?Item=N82E16814150590 worth the money and is it good for a system with a intell i5 2500.
I would say yes!
It is fine, but I'd grab an MSI 7950 instead. XFX may have a fantastic RMA/warranty, but they are low-quality cards, generally, with "moderate" quality parts. MSI makes some great stuff; the Twin Frozr cooler will perform better, and the quality of the components on the PCB itself is greater. The VRM will most definitely be superior on the MSI 7950, allowing for stable OCs, probably in the range of 1150-1200mHz GPU clock.