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1. 580 will fit fine in the phantom.
2. Corsair 650 will be fine to power the 580.

Make sure you get one ordered they are a royal pain to find instock these days. I was wanting one but couldn't find one in stock, so ended up with a ASUS DIRECT CUii version of the card, which is a great card too and very cool it idles at 30c and max seen it hit on BF3 ULTRA settings was 51c.
BF3 MP you mean I guess, I have not really seen any real problems mate, some people complain about certain things, but honestly the game plays fine aslong as your internet and the server you are on is working right. Also there will be some updates soon I guess to fix and patch any problems that are there, it still is a new game so expect it to get a few updates and fixes. My experience of the game has been very good on 1 x ASUS GTX 580 DIRECT CUii with 1.5GB on a 26 inch 1920 x 1200 screen. Great game that shows off the hardware well. Just the Single player could have been better I think but BF was never really great for SP, that is the area for Modern Warefare I guess.. Looking forward to MW3 too and hoping the SP will be good, the MP on MW3 i'm guessing will not touch BF3.
but that was some good info thanks!Yes they are really hard to get hold of mate, that's why I ended up with the Direct Cuii model of the card, to be honest the card is great and no complaints and I managed to get the card when it was on offer here for £383.99 so keep an eye out for the weekly offers. The Matrix when I have ever seen it in stock was a whopping £499.99 and I'm not sure I would have paid that for it to be honest, it's kinda expensive for what it really is but again you pay for great quality.
Some reviews here of both cards
Asus GTX 580 Direct CUii
http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_580_Direct_Cu_II/
ASUS GTX 580 Matrix Platinum
http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_580_Matrix/
These will give you an idea of what both cards can do, also never done a benchmark on Crysis 2 but have all the high resolution texture pack installed and full patches and it runs great on max settings, not sure what frame rates but it runs really fast and a lot faster then the 5870 I had before. May get round to doing some benchmarks on it, but normaly I don't do that unless I see some problems. The ASUS GTX 580 Matrix Platinum 1.5 GB review here shows the Crysis 2 test and the Direct CUii is almost the same speed as you will see from the other review if you compare the other game tests they do there.
Crysis 2 test
http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_580_Matrix/12.html
Thanks a lot for your help 

Just a heads up for you, OCUK have the Asus GeForce GTX 580 Matrix Platinum 1536MB GDDR5 PCI-Express Graphics Card in stock at a special price at moment of £419.99 inc VAT.
http://www.overclockers.co.uk/showproduct.php?prodid=GX-260-AS&groupid=701&catid=1914&subcat=1812
GRR![]()