If you want a DAW that's decently powerful and does everything but tempo changes and routing, check out Acoustica Mixcraft. Super easy to figure out and use and comes with a ton of pretty good virtual instruments. Costs $90 tho.
if you want a full-fledged DAW that can handle tempo changes, routing and anything else you can throw at it, check out a program called Reaper. It takes a while to figure out how everything works and doesn't have too many VIs but you can add all sorts of free ones easily. It does come with a great suite of virtual effects though. Also, if you stick with the trial version, it's FREE. There are also no limitations to the trial version vs. the full version. After 30 days or x amount of time it'll try to get you to buy it but just keep clicking "still evaluating" and you can keep using the full software free of charge.
anyways here're the links if you're interested
http://www.acoustica.com/mixcraft/
http://www.reaper.fm/download.php 
