Should I trust "Trust"

So I will buy the Sapphire HD 3870 and apparently I need a new power supply because the card needs at least 450 watts. I found one from Trust at 570 watts for 57 euros(about 80USD). Should I buy it? I mean, it is so cheaper than other ones. In example I saw one power supply at 320watts for about the same price! I think that Trust is a good company..But that price...
Also, is it easy to put this part in my computer? They told me I have to unscrew some bolts, and connect it..Is that right? I have some experience at installing parts in my PC (Last month I installed two Gigs of RAM)..Can I do it?
Sorry for the big post..
Here is the link for the product: http://www.trust.com/products/default.a ... ER&grp=PSU
If you got any questions, suggestions etc post them
Cheers
Also, is it easy to put this part in my computer? They told me I have to unscrew some bolts, and connect it..Is that right? I have some experience at installing parts in my PC (Last month I installed two Gigs of RAM)..Can I do it?
Sorry for the big post..
Here is the link for the product: http://www.trust.com/products/default.a ... ER&grp=PSU
If you got any questions, suggestions etc post them

Cheers