A monitor is something you shouldn't have to regularly upgrade. If you're going to get something, wait a bit for something that has much more resolution support as well as vga imputs.
I have a samsung 240T (the 244T and 245T are better, but eh) and its awesome. When I first got it, I couldn't believe the desktop room. I also have a LaCie 22 BLUE CRT thats 22" but support 2048 x 1536. Its a nicer monitor, but takes up more than enough room on my desktop so i switched to my samsung.
Its funny really. Before 1998, I had used nothing larger than a 10" laptop screen. Then I got a 17" crt and thought, "Wow, its huge". Then I got a 19", 20" then 21". Then I got my 22" CRT and 24" samsung (most of this stuff is refurbished). You get accustomed to a certain size and then you want bigger. I'd be worried that if i got a 30" lcd, i'd end up buying a second one b/c i'd want more room. :lol:
I was considering buying an apple or dell 30" (I don't like the dell brand, but the price is VERY GOOD), but after reading the supported resolutions, I'm holding out. Maybe I'll just get another samsung, mount 2 of them vertically and place them side by side. Now thats a big desktop.
If you don't mind having something as "small" as a 22", you could get an old lacie 22" crt. It's one of the best monitors I've ever seen. Otherwise, hold out till 30" screens have more support.