In reply to:

Oh...i forgot. I have Bose Accousticmas 10 . I bought it 2 years ago..and I realized now that the sound is awful...to my ears...



Now that I know that....without a doubt, get new speakers.

A new reciever may improve the sound a bit, and give you a couple new "features", but if you're looking for the biggest bang-for-your-buck improvement, a new set of speakers should be your first step.

How big is your room, how big is your budget? We'll go from there.