IMHO to get it to where you'll be satisfied you're probably spending upwards of $3000 parts and labor.
I agree to the extent that I would suggest that you might want to consider holding off on any suspension work until you can afford updating everything that needs it.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
You might be able to find a lightly used stock suspension for sale in the classifieds - hint, hint. I have an almost complete setup listed - springs, shocks, sway bars and sway bar bushings - if you want to go that direction.