Here's a top three geek tips from a professional (ie, I get paid to do this crap) geek:
1) Don't listen to forum weenies who whine that one thing is teh sux0rz and something else is teh r0x0rz, because they're probably speaking directly from their rectum.
2) Learn some of the basics of all of them, so you make an informed decision, and get what fits your needs the most
3) Get whatever does what you want it to do for a price you can afford
Lizards: I suggest you stop spamming a thread with uninformed (and uninformative) drivel, unless you suddenly know how to fix Radiant on Mac OS 10.5.
Glunnator: You say X11 won't launch; did you do a clean install of 10.5 or an upgrade and install? I had a few issues with it myself, but things work now. Try opening Console and starting X11 by hand, see if you see some xorg errors float by in there (in my case it would "start", then crash quietly, and launchd kept trying to restart it every 10-15s).