what have you done to your honda accord?

I have a 1999 Honda accord LX, and I am just now starting on the mods, I have a decent start on the audio front, still working on a few things in that department, but now it's time for the speed thrills. and I was just wondering what everyone else has done to their "stock" accord motor? I know I can add exhaust, intakes, cams, and high flow cat. but I was wondering what people have done in the way of building up the motor, and what it cost? also if these required a mechanic, or not, I have no shop around here to do this type of stuff, and I would like/have to do it all myself, so I would probably only want a project that would take a day or two. this is my only vehicle (besides parents) and I drive it daily.