bose is over hyped and over priced,
try yamaha if you can,whatever you chose make sure you listen to it before buying.
make sure its 5.1 channel or more, if you get one on these make sure speakers are placed correctly as well, otherwise it will be just waste of money.
Major things to pay attention are:
room size and structure
willingness to run cables to put speakers in right place
if thats not possible try to find home theatre with wireless speakers
also if you already have plasma tv then its fine, otherwise dont go for plasma get LED one which has better pic quality and most of these are razor thin