Get the awesome and inexpensive surround sound speakers: JBL Lsr 305 MKii here!
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Or get the bigger version of them and blow out the walls with the: JBL LSR 308 MKii here!
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And don't forget your subwoofer: JBL LSR310S Subwoofer here!
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In this video, Cinema Sound main presenter Mark Edward Lewis describes a HACK that helps solve the issue of placing speakers in position where they cannot be equidistant from the listener. Of course, you'll always have the ability to use an amp which can correct this (if it does), but you'll want to be able to hack your surround sound speaker position problems manually so you can fix issues as they come up.

Learn all of this and more about surround sound mixing and media by streaming the 85 hour Cinema Sound education:

http://www.cinemasound.com