Cost no object I'd suggest our Ohlins Track Package:
Arcflash LLC - OHLINS ROAD & TRACK COILOVER SUSPENSION
Arcflash LLC - RACECOMP ENGINEERING 2015+ STI SWAYBARS
Whilteline Roll Center Kit:
Arcflash LLC - Whiteline Subaru Roll Centre/Bump Steer - Correction Kit
This is a great combo but of course is not within your budget..
If you're going to stay at or below $2k I would suggest staying away from coilovers:
RCE Yellow Springs
Whiteline Roll Center Kit
PM me and I can put together a package deal for ya.