try Acid Pro, made by Sonic Foundry. You can download a free trial version which allows you to lay down a limited number of tracks, but it has most features of the full version, such as looping, cut and pasting tracks. I used it for a while, and it took some time to get used to, but it produced good results.

also, i think Cakewalk has a free trial version, but i've never used it before.