Lets all please stop looking at number of pistons as a measure of braking force.
Total piston area, yes. But 6 small pistons vs. 4 bigger pistons may (or may not) come out with the same piston area.
Now a 355mm kit is a bit of overkill.
Anyway...I agree with Dave-ROR that if you're looking for an easy solution with low noise and maintenance, the smaller stoptech and AP/Stillen street kits are great choices.
For a slightly better track set-up, the AP/Essex kits are very very hard to beat for the money. The endurance kit will perform really well with r-comps and lots of power.
- Andrew