There are plenty of alternatives to iTunes but we would need to know what type of computer and what operating system you are using before we can offer specific suggestions.

The short answer: just about anything except Windows Media Center, which is as bad as iTunes, is better than iTunes.

Have Toshiba all-in-one with Windows 7 Home Premium - 64 bit - 6 Gb ram

On windows I primarily use Foobar with the Facets plugin, which works REALLY well if you have your metadata in order (same goes for most, if not all media managers).  A few years ago when i selected it it seemed like the only option.  I have also heard good things about J River Media Center but never used it myself.  If you search the archives you will find plenty of lively discussions between BillB, me and others extolling their various virtues and sharing tips about how to best utilize the available metadata fields for classical programme. 

However with the seeming explosion in interest in PC-based audio over the last couple of years I am sure there are now a whole raft of options.  I have to confess I gave up the unequal struggle and moved over to Mac for most audio and video needs a coupe of years ago now so I am not really up-to-date with the windows options any more.  Looking forward to hearing from those that are.