After finally settling on speakers for my new setup, I've purchased my front towers and center channel. Now I'm looking at picking up surrounds for a 7.1 system, and a sub. My budget would allow me to get either 4 bookshelf speakers for surrounds, and a bigger sub, or it would allow me to get 2, possibly 4 dipole surround speakers and a *good enough* sub.

The speakers I'm looking at in particular are (4) Monitor Audio Silver S1's for surrounds (side and back) and then a SVS 20-39+ PCi, or Monitor Audio SFX dipole/bipole (4) and a SVS 20-39 PCi.

I guess my question is how good of a thing for movies and multi channel music are the di-pole/bi-pole surround speakers. I tend to think that a bookshelf, especially a well reviewed one like the S1's would have better sound quality. The di-pole/bi-pole speakers would have better room filling effects. My room is 20 feet long and 14 feet wide, so it's not too terribly wide. I'd think that the di-pole/bi-poles would do a better job of eliminating dead spots and such. However, I think as I said that the bookshelf speakers would sound better, and more sub is always a good thing.

Any thoughts and advice will be highly appreciated