WRX or Evo might fit your bill; both would be good 4-seat DDs and would be competitive locally. Mini Cooper may, as well.

Something else to consider is the ST reorg is mixing things up a bit, splitting ST into STF and STC and putting other cars specifically into STS, STX and STU. Scroll down to page 19: http://www.scca.com:8080/assets/11-f...k-nov-solo.pdf