Bill,
The answer to your question is... it depends. It depends on what you set the crossover of your speakers. If you're crossing over at 60-80 range, full range may be a total waste unless you are totally concerned with absolute timbre matching across all speakers. The general, conventional wisdom is that it is a waste to go "full range". However, the appropriate thing if you have room and $$ is to get the same exact speaker for all your speakers. So, like I said, it depends on your goals and why you are asking. Personally, I'd put the money to full range surrounds and rears into the best possible fronts that I could afford and then get timbre matched bookshelf surrounds with a sub. I do both 2-channel, multichannel music, and also movies. So I want a setup that can appropriately accommodate all with minimal trade offs.
The answer to your question is... it depends. It depends on what you set the crossover of your speakers. If you're crossing over at 60-80 range, full range may be a total waste unless you are totally concerned with absolute timbre matching across all speakers. The general, conventional wisdom is that it is a waste to go "full range". However, the appropriate thing if you have room and $$ is to get the same exact speaker for all your speakers. So, like I said, it depends on your goals and why you are asking. Personally, I'd put the money to full range surrounds and rears into the best possible fronts that I could afford and then get timbre matched bookshelf surrounds with a sub. I do both 2-channel, multichannel music, and also movies. So I want a setup that can appropriately accommodate all with minimal trade offs.