You'll have to disable your Intel graphics, and then use driver sweeper to uninstall everything in safe mode. It's not hard. Just install the driver sweeper program and use it.
As for those cards, $10 is a big difference there in terms of what you get. It's obviously a little faster, but the FTW version comes with a cooler that's twice as big (ACX), and - most importantly - power plugs. Check out the difference power plugs makes on the 750 ti through Linus Tech Tips' video:
https://www.youtube.com/watch?v=zcrFzOpTHkw
(Linus reviewed the ASUS, but the EVGA's pretty much the same)
It'll give you a good deal of extra performance potential. Definitely worth the $10 to me.