You need to have access to and be competent on all systems. My weapon of choice is the MacBook Pro. Pretty fast hardware. Swap in a 500gb hdd and triple (or mo

You need to have access to and be competent on all systems. My weapon of choice is the MacBook Pro. Pretty fast hardware. Swap in a 500gb hdd and triple (or more) boot os x, windows (xp and vista), ubuntu, bsd, etc. Or you can get a bunch of different machines and use synergy. I found that to be most useful for testing web stuff across platforms.