10x13 is small.gonk gave a good list of brands.i'll add that you really shouldn't need more than good bookshelfs(and stands for the front) and don't forget the sub.i'm in a 10x20 basement room and did run 5.1 with b&w 601's up front and it has always been plenty,but theater is in limbo while i play with makin' my own speakers.

smaller towers could be used depending on furniture placement.myself,i like a line of sight for ALL drivers(sub can be excluded).i don't want a woofer in a tower blocked by a chair.know what i mean?

7.1 may be hard in a room that small.you might consider in-wall speakers all around.