I work in IT and switched over to mac a while ago. i would not go back to a PC, unless to dabble with an Asus EEE or the like.
I have a 15" mbp, and i run both ubuntu and xp in using parallels, but not really as I just use those OSs to test with. ok there might be one windows app that i need.
RTFM on the mouse, you can use a two button mouse with a mac, its just that apple doesn't make one..i use a kensington bluetooth (i don't like using a touchpad on any system). you can do limited "multitouch" with macbook touch pad though.
i have found good a OSX app for just about everything.
you also then get to join the mac fanboi club, which is an interesting subculture of society. basically you pray to steve jobs hoping that he will deliver fresh aesthetic toys to you quarterly, and just *HOPE* he allows you to use Timemachine with your AirportExtreme (i mean fully, not that hacked wack way). you also get to scoff and windows users and in general act superior to non-mac users. this part makes it all worth the "apple premium". they are nice systems, i'll buy another macbook pro to replace this one when it croaks. i bought it with minimum specs and upgraded the RAM and HD myself down the road as apple charges way to much for upgrades. i just put a 320gig HD in last night w00t!
of course you could always just build a PC and run OSX
http://lifehacker.com/software/hack-attack/build-a-hackintosh-mac-for-under-800-321913.php