well..
most people will tell you Eibach-Bilstein combo, 250 for springs, but 500 for shocks , i couldnt do that right now, cause i put everything new underneath the car, i have just finished mine , H&R and KYB $408 delivered for both from tire rack, i went with H&R after a lot of research , H&R basically invented the aftermarket spring, i know an SCCA racer that uses them, its a very high quality product, they dont offer us the racing spring(red) but i didnt want that anyway. Some people have an issue with the progressive spring, i dont, its fine if you ask me, just have to get used to it.
the only spring for us that i know of that is linear are the Tokico kits, but they dont lower enough for me. The car feels great, im sure if i had the Bilsteins it would be even better , but they would have doubled the cost of my rebuild, so i'm waiting till my KYB's are shot. Tokico shocks arent too expensive, but the Konis(if you can get them still) and the Bilsteins are the best. I can tell now tho... that i've got to start thinking about a Sway bar upgrade

so leave room in your budget for this as well.