edit: Anything posted in this opening post (about a year ago as of now) may be outdated! The linked guide is continually updated by powerhouse.
If all your hardware can support hardware virtualization and PCI/VGA passthrough, you can do Xen (edit:or KVM) virtualization, and not need to dualboot. It's like running two operating systems simultaneously. There's a guide here:http://forums.linuxmint.com/viewtopic.php?f=42&t=112013
It looks like quite a bit of effort. I think I'm going to consider it when the next LTS release comes out. I will probably need a different set of hardware.
Unfortunately, ATi cards are MUCH more likely to be supported. Only a few cards from nVidia are supported, but I saw rumors[www.gossamer-threads.com]
on the mailing list for Xen that they might soon see support for them as a patch to the source code.
If anyone tries it, give us a bit of feedback so we know your experiences :) You can also feed back on the Linux Mint forums, which will be helpful to Mint users and anyone who uses that tutorial.