I've seen several KVM switches that have USB, some of which use VGA for video, others use DVI. There are lots of options there if you do some web searching. Hopefully you can do pure DVI.
There are indeed Mac drivers for the QuickCam for Notebooks Pro. You don't need Mac drivers for the mouse and keyboard, but they are also available from the Logitech website and have some extra settings, adjustments, etc. Logitech is a very Mac-friendly company.
Macs are great for multimedia. Even though I'm surrounded by PCs here in my home, I use my PowerBook (my only Mac) for almost all of my photos (with iPhoto and with Photoshop CS) and home movies (iMovie and iDVD, and sometimes Final Cut Express). My main use is presentations via Apple's "Keynote" app. I have not yet done much with Garage Band or iCal. I do have MS Office 2004, but I don't use it much with OpenOffice and Nisus Writer Express. The included AppleWorks also has most of the features I need. But really, I use my PC for most of those Office style tasks. The same for web browsing. Apple's Safari is great, and so are the Mac versions of Mozilla/FireFox and Camino, but again I usually do most of my web browsing on my PCs.
For TV tuning / capture, there are several options:
http://www.elgato.com/index.ph...e=products_eyetvwonder
http://www.elgato.com/index.php?file=products_eyetv200
http://www.plextor.com/english/products/TV402UMac.htm
http://www.formac.com/p_bin/?c..._converters_studiodvtv
For FM radio:
http://www.griffintechnology.com/products/radioshark/
If you want to pipe the media from the Mac to your TV there is this:
http://www.elgato.com/index.php?file=products_eyehome
But you could also just buy the $19 composite & svideo adapter from Apple.
The only problem I can think of is the current lack of 5.1 audio out on the Mac Mini. From the looks of the spec sheet, it only has a stereo minijack. I would expect someone like Griffin
http://www.griffintechnology.com to make a 5.1 adapter, but time will tell. There are some options though, such as the Transit or Sonica from M-Audio
http://www.m-audio.com/index.p...mp;ID=consumerproducts but they're probably overkill.
Of course, you don't have to start out big. If you're interested in exploring Mac OS X, buy a Mac Mini for $479 (you're a student, right?) and play around. You can probably figure out how to add ram without breaking it (and thus breaking the warranty) in the future and you can always add Firewire and USB gizmos down the road. Firewire and USB hubs are cheap if you need more ports, but again, start small and buy what you need when you need it. I don't have any accessories for my PowerBook other than software and a MX900 mouse I also use with a PC, yet it serves my needs perfectly.