Check out the SurfZone on Boatertalk- a whole forum dedicated to surf kayaking. BoaterTalk: SurfZone
I'd look at Necky, Fluid and Riot designs - they tend to have long, hard chines. And something longer than the newer playboat designs. Has to have good rocker to keep it from pearling.
If you do have a budget for a new boat, Fluid is making a surf boat: http://tinyurl.com/2fdaxjf