My 24" seems ordinary to me after a couple years of use. However, I'm in no hurry to replace as I probably cannot improve on the image quality.
Looking at 30" at the store, it borders on being too big. But, I would get used to it. I seriously wonder if that isn't close to maximum, though (at my desktop viewing distances).
If I do switch to a "big" LCD, I know I can't take the low picture quality and limited view angles of the 6 bit ones. They would not work well in a "big" screen because the contrast would change merely looking left to right at desktop distances (I can already see that in the 24" LCD HDTV/monitor we own). I desire excellent color and wide view angles (needed to maintain the color fidelity as one looks around the screen) at a "reasonable" (not cheap) price.
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ATI HD4870 512MB, ATI650 HD Tuner, Phenom II 940 @3.35GHz, 4x2GB OCZ PC8500, ASUS M3A78-T, WDigital + 4x Seagate 7200.xx = 3TB+, Plextor DVD, PCP&C S75CF 750W, Enermax Full-Twr, 2xSony CRT (24" 16:10 + 21" 4:3), 5.1 Spkr, AT ATH-AD700 Phones, Cougar+FSSB, Saitek X52 Pro, Windows 7 HP 64b, Windows 7 RC 64b, Vista HP 64b