It very much depends on your taste in music I suppose. I use and heartily recommend EMusic.co.uk, which is brought to you by the people behind AllMusic.com - an excellent internet music resource. I pay £15 for 80 downloads a month - there are a number of subscription plans for more and for less than that.
I use the site mainly for indie music - if you're looking for the latest Madonna album you're not going to find it here. They also have an excellent selection of jazz and classical, plus folk and blues.
The tracks are all rights-free so you can use them anywhere, and are ripped using high quality variable bit rate.
If I can find your email address I'll send you a link to it, as I get a kick-back for new joiners!
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