IPS panel equipped LCD Monitor will always cost around 2-3x more than the same diagonal sized TN panel equipped. Dell U2410 is IPS Panel equipped, Apple Cinema Display 24" is IPS too. There's another panel tech that's a little bit cheaper, faster response and very small difference in color performance than IPS, that's S-PVA, Dell 2408WFP is one of them, cheap and GOOD, quite fast for gaming - the middle compromize
S-PVAs are mostly 1.5 - 2x the price of similar priced TN. Say a 24" TN costs 300, a S-PVA will cost 450-600, IPS will cost 600-900, sometimes more when we're talking about the professional grade (up to 1500 IIRC).