So I'm thinking of getting an Onkyo HTiB (this will be my first surround sound setup). Is it possible to get the 5.1 set and later add 2 more speakers to make it 7.1 or will the receivers not be compatible? What type of decoding do I want? The 7.1s don't do Pro Logic, but the do Pro Logic II. Good, bad, ugly?
7.1s - $399
5.1s - $259
7.1s - $399
5.1s - $259