CrapCommando

Hi, I'm wanting to boost the performance in my 2003 2.5L Forester XS (non-turbo) what would you guys recommend? I'm mainly interested in boosting the acceleration rather than top speed. I'm on a bit of a budget so super chips and the like are a bit out of my league, preferably DIY stuff, I'm fairly handy and have been pulling apart and putting back together my car since I was about 10 so I know it pretty well. Any tips would be greatly appreciated.