Phil Imray was my BSS keeper at Dartford, and he was top drawer. You may be able to sign Christophe Mey if you have the French leagues loaded, who's a top keeper up to LG2, or failing that, you could try and loan Martin Hansen from Liverpool. He'll eventually become a top Championship keeper.
My star of the BSS was Lewis Ward. Significantly better than my old keeper, and he only costs me £40/week. 45 apps, 39 conc, 17 clean sheets. We got hammered 6-0 a few times too so he is pretty solid.
He holds his own in the BSP but I'm looking at upgrading for the new season. But if finances are a problem, he is basically free.