Well, a couple years ago I asked the guy from lazercams.com for a quote on a custom cam (he has a form you fill out online, then he sends it back to you and gives you the specs and prices). The cam he showed me had about .440" lift, can't remember the other specs but I still have the e-mail, anyway he quoted me $168 for a "slider" and $288 for a roller. Of course, there are other cam options out there but I can't say I'm overly familiar with all of them.
Oh, I should add, there was a guy on turboford who was running an A237 (same thing I have), with a holset and something around 20 psi and he made 300 hp.