I have the 27" iMac, and I am completely in love with it. The monitor is GORGEOUS - and scrapping on it is so much fun!
I really miss my laptop though, so I'm eyeing a MacBook Pro. However, money would have to start falling from the sky to have that happen, so I'm sure it's just a dream right now.
I thought the transition from PC to Mac would be much more difficult, but it was super easy.