Some people are really hellbent on putting down TN panels and preaching the superiority of IPS panels. At this point I would like to point out that I have considerable experience with all sorts of panel types - CRT, plasma, LED, OLED, LCD (TN, PVA, S-PVA IPS and S-IPS). I therefore can say, with a broad and impartial voice; the panel type is not the be all and end all of image quality attributes.
I could harp on all day about how beautiful OLED screens are compared to any LCD panel I've come across and how they will change the world, but in truth you'll only get your hands on worth using these days by raiding the R&D factories of Samsung. What I could not harp on about all day are the advantages an S-IPS panel gives you, for games, over a good TN panel like the Samsung SM2433BW. It is true that the colour accuracy is slightly off on the SM2433BW (especially if you pass your head too far from centre); but this is only something you need to concern yourself with if you rely on accurate colours and it is not something you should notice or care about as a gamer.
I would also like to point out that a properly implemented LED backlight (so far I would say that Samsung are the only manufacturer to impress me on that front) can make a huge diffence to colour gradients and accuracy. I haven't done anything like a side-by-side comparison, but in my testing with collegues the XL2370 (TN panel) offers pretty accurate colours after a very small amount of calibration. The successor to this (PX2370) should hit UK retail next month and will hopefully offer very pleasing colours in the sRGB photography mode.