Best bang for the buck setup will be Koni Yellows with Ground Control Coilovers.
The Konis are absolutely amazing shocks, and with the Ground Control coils, you have 4 inches of ride height adjustment, as well as being able to get custom spring rates to accommodate your driving style.
around $750-$900 depending on where you look for them.
if you're just looking for some coilovers to lower your car, then save yourself the trouble and just buy lowering springs from a reputable company.
**Tein S-Tech lowering springs - $160 +/- new (i used to have them, they were awesome. plenty low, and comfortable. NOT FOR TRACKING THOUGH, SPRING RATES ARE AS SOFT AS STOCK)
or you could get Eibach, Skunk2, H&R, etc. any of those companies will offer you a good set of lowering springs.
Coil-overs are for the big boys, lol. for those looking for a good range of adjustment and a quality performance ride.
good luck, but as others said, this thread is pointless without the critical info:
Performance? (slightly rougher ride, to a really harsh ride)
what do you want out of them? THEN we can provide a thorough answer for you