Itunes, is a ripoff, I use ZunePass, it's $15 per month and you can download as much as you want, including all new releases that you can get on the date they're out, then you can keep 10-songs per month.
The catch is that you can only listen to the songs on a Zune or 3 different computers as long as you have a subscription, once the subscription is done, the songs won't work, however, there are programs out there that will pull that protection out, so really you can keep them forever and put them on your Ipod
I live on my computers, so for me, it's wonderful to have, one click and you get the whole album.