If you want to strictly stay within your $1000 budget, here are my suggestions:
1. Short shifter with bushings. Bushings are key to this upgrade.
2. Sway bars minus the endlinks (to stay within budget). You should be fine without endlinks as long as you don't get uber stiff bars. Even so, if you break a factory one then replace it.
3. AccessPort using a stage 1 map.
With a bit of bargain shopping and online coupons or sales you'll be within budget. Also, with these mods you'll have your warranty intact for all intents and purposes. I did these three upgrades to my '09 and each one was a noticeable improvement.
I just realized this thread was revived from the dead. ooops.