I've got to agree with JMeister. Your current setup is better. Much better!

Go hang out at Home Theater Forum or AVS Forum or any other audiophile forum and they'll all tell you the same thing. So long as your speakers don't have foam rot, they're worth keeping and even then, as you saw, you can have them re-coned.

The Bose simply cannot hit the highs or the lows you expect from either rock or classical because it just cannot move the air necessary for the bass, and doesn't have a proper tweeter.

Even if your speakers have truly died, I'd suggest keeping the Marantz and getting any number of excellent bookshelf speakers and a sub. Bookshelf speakers are generally the most accurate speakers you can get and you don't have to spend a lot to find good ones. Some bookshelves even have sub-woofers built-in so you can get some proper bass that the 2.5" drivers of the Bose can't begin to match.

Quite frankly, the Bose is fine, if expensive, for casual listening and talk radio, but if you want to really be overwhelmed by your music, then it can't compete because it just can't move the volume of air. It's a matter of physics.

My ultimate suggestion is:

Put the money toward a proper stand. They're out there. Go to a high-end audio store and look at what they offer. Get a good stand and replace your TV with a flat panel. You'll need a stand with much less bulk, have excellent sound, and a TV that can do hi-def. Dump the VCR. Transfer your home videos to DVD and replace your commercial tapes with DVDs or Blu-Ray. Get a Tivo, an HD-DVR, or just plain NTSC (or ATSC if Canada's going hi-def) box from your cable/satellite provider if applicable (I have no idea what Canada is doing about HD) or just get Tivo.

Word of warning, Ikea uses particle board too. If you shop there, pay attention to the weight ratings and weigh your components before you go shopping.