<font color='#000000'>mmmm, a 1000 dollars will be a challenge, but anything is doable. but just to be sure, lets lay out everything you already have:
TV
4 Speakers
Component video cable
DVD player
You want / need to purchase:
Dolby Digital 5.1 Receiver
Optical cable
Subwoofer
(*If your going to purchase a sub, you need a sub cable)
A good *cheaper* upgrade you can do for yourself as well is upgrade your speaker wire to a better brand, 12 to 14 guage preferred.
When I mention cheaper, it won't be rock bottom priced, but not dear...
Let us know if this is what you need as listed above...
PS: What format of music do you listen to? Do you have the player for that? For example CD player?</font>