buy an 04 CTS with a manual or an 05 preferably with the HF 3.6.
If not, and you cannot find one in your price range, consider a 04-06 GTP G6 with the 3900 and 6speed manual, nice car in sedan or coupe and nice power and manual.
Otherwise, I'd look at an Ion RL quad coupe or maybe an 04 GTO (best interior at GM in 04, grand am exterior styling) with a 6speed and the 5.7 LS1 350hp.
CobaltSS