I like Reaper.....the best thing about it really..well, not best...but is sure is nice that you can use the thing as long as you need before you decide to buy it. It does have a trial period of course, but it never stops working. For 50 bucks...it's really good.
What I have on my computer is Mixcraft 5. This program is fairly light compared to Reaper..but is sure is a lot easier to use. I have Ableton suite 8 on my computer, but I can't figure that thing out at all.
http://www.acoustica.com/mixcraft/