Decisions, Decisions...

So although I am very excited about the possibility of getting a MacBook soon... I've decided that getting a nicer, more professional camera should come first. I've been playing around with some Digital SLRs that some friends have very generously let me try out, and I've fallen in love with them. I've been a Canon fan since I got my Canon Powershot S5IS last October, so I definitely want to stick with a Canon DSLR.. Now I have to choose.. Which One??? Decisions, decisions....