You can get a set of KYB GR-2 shocks for $160 for the whole set from www.tirerack.com
springs, I recommend Neuspeed Sports or H&R Sports, they both drop a 1/4" lower in the front than the back to even it out, unlike the prokit's which lower same in front and back, expect to pay at least $140 for the springs
as far as installation, expect to pay at least $85 to $100