Have ya ever tried using drum loops? (those things that are royalty free and recorded professionally). Like get jazz, rock, afro-cuban and electronic then you just piece them together by either taking sections, whole parts or individual hits.
To write a song, just import about 50 of them and drag em around until you have a song. Then if you want to strengthen the beat, add some midi kick, snare and cymbals.
There's a kewl program called ReCycle too. It lets you take a drum loop (or any loop) and splice it up so that you can alter its bpm. Like you can take a 90bpm drum loop and speed it up to 120bpm without any noticeable sound change.