its a matter of opinion of course but the e-ips linup that dell offers seems to be pretty popular on here. personally i feel this is much better than a tn panel however they are also more expensive.
quite a few users seem to be happy with their tn panels though. it all depends on what YOU think about them and not what anyone else does.
go to a local store where you can view the differences yourself. this is the best way to judge what you like and what you dont like. i've done it, others have done it. its the only way to actually "know"