There have been tons of deals lately on brand new Diablo Edge iron sets (usually 5 - PW) averaging $250 or so. I don't know if Callaway had been trying to offload inventory lately or what, but these keep showing up on the deal sites.
In my opinion, you're probably not going to find a better set of sticks (especially brand new) in that price range, not by a long shot.
Edit: In case anyone is thinking "put up or shutup" Here is one such deal: http://slickdeals.net/f/5074206-Callaway-Diablo-Edge-R-8-piece-irons-set-for-239-99-tax-free-shipping-at-GolfGalaxy-com
I'm not an employee of Slickdeals, Golf Galaxy, or any of their affiliates, just wanted to provide an answer to OP's question. If that link breaks any forum rules, Mods can edit it out