[RPM427]

I would recomend you get the starter box, plus the chassis brace package. You get the following:

H&R Race Springs
MM Caster / Camber Plates
MM Urethane Pinion Snubber
Bilstein struts and shocks
Front and rear spring isolators

MM Strut Tower Brace
MM 4-Point K-Member Brace
MM Full Length Subframe Connectors.

all this for ~$1,300, and is perfectly fine for the street

The most important thing is stiffening up the chassis for a good foundation. If you can't get the two at once, get the chassis brace package first (~$300).