hi all, i've been playing with the idea of getting a drum machine and think i have finally talked my self into it. i only want to spend about 200.00. i want something with a butt-load of drum tracks (since i don't have a drummer to play with right now) and maybe even some overlaying music that i can put a bassline to. the only ones i have been looking at are the Zoom Rhythmtrak, Alesis SR16, and the Boss DR550 mkII. i am open to any and all suggestions. what i should be looking for? any help is greatly appreciated. oh yeah, since i've never owned one, i need it to be as user-friendly as possible.