for a road going car, i'd say piper 270's.
i know everyone will bang on about how they don't produce the same peak power as the 708's, ph3's or 285's but if you look at a power graph, the 270's give more power across the range.
also, 270's don't have to be re-mapped, you can run the car well with a decent gain without it having to be re-mapped.
and if you plan on doing anything else to the car in the future, re-maps are a waste of money, get a stand alone ecu.