Certainly is doable but since heatsink/fans need to be removed/replaced, I'd feel more comfortable having someone experienced do it, since getting that wrong could end up with a fried CPU or GPU. It's not overly difficult (I've done similar before, that laptop looks easy compared to some I've worked on), but experience is very helpful.
That ebay auction mentions that it's an engineering version, the card needs to have its BIOS flashed. No idea how to do that (i.e. can one just do it from the laptop, or will the video card not even work before it is flashed). I'd be very careful in getting the replacement card.
Lol you could even upgrade the card!
http://forum.notebookreview.com/msi/...bone-16f2.html
Though it talks about modifications for different cards so the heatsink matches, not for the faint of heart
Overall you have to ask is saving $150 ($250+ for the card and shipping, self install, vs $400 for the fix) is worth the risk. Or if $400 is worth saving the laptop. Might be able to find a cheaper repair on Kijiji.
This could be worth a try, I've done this with success (though it only lasted 9 months):
http://lifehacker.com/5823227/save-d...ke-in-the-oven