I like the drums, i think for these kinds of tracks you want the 303 to go CRAZY. A good example to me is from MC2's sound track: D-Noiser - Brain 30 [Train Psycho 303 Mix]. The 303 doesnt come in until like 2 minutes in, but when it does its so crazy its sick. Give it a listen and it might give some good 303 line ideas too (that whole soundtrack is great).