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I don't think he will get much out of it, even if it's the ddr3 memory version.What's your budget and the rest of his spec?
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At this point yes I would say the XBox is probably your best bang for buck. Not sure about PC gaming just being an enthusiast platform though. It does have some distinct advantages over it's console counterparts.
A rough equivalent to the 4650 DDR 2 would be the 6450. If the game requires a 3870 as a minimum then look for a 6570 (GDDR 5) or preferably above, if at all possible.
What resolution is he running btw?

Don't order anything until you've checked out the Nvidia refurb deals, almost forgot about them...
http://www.overclockers.co.uk/productlist.php?groupid=701&catid=1914&subid=2077
The 6450 has dx11 but it's not a gaming card as such, well, at all really. I expect that it will run the game but very poorly, even at lower resolutions, unless you turn everything down to low or minimum. The 9800gt wipes the floor with the 6450.
http://www.tomshardware.co.uk/best-graphics-card-game-performance-radeon-hd-6670,review-32183-7.html