I've got a 17" Philips TFT from when I started uni in 2004, my CRT wasn't gonna fit in my dorm room.
Now I only use it for MSN, so I can see stuff while i'm in-game.
And I've got a 24" TFT which I got shortly after I graduated in 2007.
Paid 450 quid for this baby, it's a Dell UltraSharp.
At some point I'd like to get another 24", but I can't really justify it, I don't need it.