my old one, was t34.55, 55lb blacks, 500 cooler, msd chip, standard bottom end and compression - 30psi spike and held 26/27, very very quick road car, i guess around 370hp

but it really depends on what you want to spend, i'm led to believe a t34 is cheaper than the gt series? likewise, siemens are more expensive than 803 greens

if your on a budget, t34.48, standard motor & compression, decent chip NMS or msd etc. 500 cooler or 4x4 cooler