Bought a 2.1 sys at a computer fair years ago('bout 97-98). It's got a 500watt sub and cost me £30 at the time. It has always sounded brilliant to me and never had any probs with it so never thought of upgrading it.
The satellites are connected to the sub via a plug in the back of the speaker(like the std red/white plugs you get but only a single plug) and on the other end, the bare wire splits into pos/neg and goes into the sub. Wouldn't mind upgrading the cables but don't know if you can get anything similar.
any ideas?