Looking to buy an Eyefinity graphics card for under £100

Hello. I created a post a similar post a few days ago in which I didn't get very many replies so here it is again.

I am looking to buy a ASUS AMD Radeon 7770 2GB Graphics Card for an Eyefinity setup for my new budget custom build.

http://www.dabs.com/products/asus-am...70.html?src=15

The monitors are 3 19" Acer x193w's which are not 1080p and are all at the same resolution.

My questions are:

1) Is this a good card? I'm looking to play games like GTA IV, Team Fortress 2 and Batman.
2) If you don't think it's a good card, could you reccomend a different one for Eyefinity? I'm not looking to spend over £100 (it's a budget build)
2) If it is a good card, do I need a big power supply? I was looking into a CX-600 and I've heard good things about them. At the moment I have a 400w with all the necessary cables.

Any help is appreciated!

Thanks in advance!

-Dan