If you're looking for big bass I'd take a look at Sony's XB line. The top of the line (XB-700) is massive but the isolation is fantastic , though leakage is mediocre at best. The line tapers down to some more portable models. I own the XB-700 s great fun set of cans. Massive bass, but its done quite well. It's deep and impactful but maintains enough tightness to maintain decent sound up the spectrum. Some people might say they're ugly, i think there cool as all get out. Comfortable too. Oh, and the have a fairly low impedance so driving them off an ipod is no trouble. The XB 700 is only about $90 on the street. With the 500's around $60. I cant say of anything else down the line.
Now if he's looking to save some take a look at the Monoprice 8323. Also a warm, bass heavy can. Over ear, removable cord, folds up to go portable. Well built and good sounding. The package comes with two cords and a 1/4in adapter. Best of all they're only $30 and that includes shipping. For my full review check here.
Hope that helps. any questions send them my way. I'm happy to help.
Those look good, but I figured since this guy wanted to spend a few hundred dollars anyways, I should find him something really good. The cost of those monoprice cans might just be enough to sell him over though.