If you're starting to work on your suspension, I would suggest a set of KYB's (they're inexpensive, under $300), the GMPP handling kit (~$110), and the chrome front strut support from ebay (~$28).
The GMPP handling kit comes with front and rear sway bars, tubular trailing arms, and a front strut tower support. Put the GMPP strut tower support on the rear, it will fit.
Handling will improve dramatically with this inexpensive set up.
Of course you can go with the GMPP strut/spring combo, but that'll cost a bit more than the KYB's.
Good Luck!
_________________________
Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.