You could replace the current setup with a similar new package of speakers I suppose.|
How much surround do you actually want? If you like it, maybe it's worth spending some cash getting a dedicated receiver and speakers? Or even a package that does that for you.
Need to know what you use the ps3 for? Is it only games or would you benefit from a proper 5.1 setup with films as well, for example?
psn = quaddy456