Having a bit of experience with VirtualPC, I don't believe it would provide a good experience. It's not designed for high frame rate games that implement a lot of DirectX routines. That's just not what is is made for. If you're willing to spend a couple of hundred dollars on the software, why not spend it instead on a used/older PC that'll run FMS much better?

The only area in which I feel the Mac is laking software is in RC sims (dental administrative software used to be a big one, but that's being developed now). I've been using Macs for about 10 years now, and have never suffered from any lack of available software. Where as I don't have the choice between, say, 20 different applications (15 of which are horribly flawed products) I generally have a choice between 3-5 quality pieces of software for any given application. www.versiontracker.com is an outstanding source of information on available applications and updates (it also incorporates Windows and Palm, and is much preferable to download.com). You won't find much Mac software at travelling computer shows. People who own Macs aren't real likely to attend such things. It's even difficult to find Mac software at retail locations in a lot of areas. Most Mac software is sold through a number of catalogs or online.

There's no viable RC sim out there for the Mac, and I very much doubt that we'll see one anytime soon. The only way I can see it happening is if the designers of FMS allow their software to be ported to the Mac, and enough talented Mac programmers happen to be RCers willing to donate their time in a colabrative project come forward.