I don't like stock JB's; even with 250K's there's too much 'ice pick' for me. I like it much better with an A2. Haven't tried an UOA5 in it yet, but will one day.
The C5 used to be the top SG recommendation here, until the C8 came along. C5's are bright and midscooped, C8's are warmer with more mids. Both are very good PU's, and there's only a mag swap difference between the two. Whatever your tastes are, there's something in the Custom family you'll like.