Hawkeye wagon suspension
BC coilovers would be the best coilovers in that price range I believe.
Although I do have the full suspension set up from my GB270 wagon. Standard shocks, prodrive springs, 20mm front ARB and 19mm uprated rear ARB. This did about 4000 miles before I went for the Powerstation Stage 3-Type 25 set up.
Would sell the old stuff cheap cheap but would have to courier I guess as I am in Cornwall. Still be cheap though.
the GB270 setup is much better than standard WRX and still reasonably compliant.
Also change the droplinks whilst you are at it regardles of what you get done - the WRX droplinks are plastic!