gosh so much to know and so much to choose!!
I wish I knew more about these and knew what was a good bargain!
Last thing I want to do is go ahead and buy some cheap speakers and find out they don't support Dolby Digital!!
Go a Hi Fi shop and listen to some gear hopefully you get some idea what kind of sound you like to that way as most good Hi Fi shops will have a room just for that.
SONY
Technics
Yamaha
KENWOOD
ONKYO
Maranze ( dont think i spell that right lol )
Ah all good brands and there is more of course, check some out have some fun
. I love my ONKYO it's been dam good to me over the last 5 years that i have had it.
A newer one will even come with HDMI port(s) on it too were i use a optical cable and dot have to worry about a sound card doing 5.1 sound as the amp can do it which can save some possible hassles with some sound cards and driver issue's and suck.
BUT really any of the above should do the job easy for what you need it for and you could plug your TV and what ever else it to it and works out much better than doing multi speakers from a comp\sound card.
DD i have always thought of as crap i hate it even more so in the time when tape decks were in us as it would tent to remove the hiss that you wanted gone but remove other sounds too while at it.