I used
Media Monkey for a few months and while I never payed much attention to the exact amount of system resources it used - I never noticed any of the performance issues that most people have with iTunes. In fact, the only reason why I went back to iTunes is because Media Monkey wouldn't sync with my 80 gig iPod classic.
It'll allow you to create playlists and search your collection as well as displaying your album artwork automatic search and import of new music on your drives and it may even sync with whatever walkman you're using.
Give it a shot.