...Ok back and feeling better (and more serious now).
On the playback side there is nothing more important than the speakers. This is the last device in the chain where all the fancy stuff comes to an "air pump" that is going to wobble the air so we can hear the original track in either the most transparent way OR with our preferred DSP added to it. What we definitely want to minimise is any colouration to the noise introduced by the speakers (regardless of how nostalgic we are about it!)
While the speakers are the most important component, I imagine that like most people we end up settling for what we consider good "value for money" and that the amount spent on speakers will probably be a reflection of the demographic the user comes from (mmmm a Phd Thethis in this one I think). Any way, I purchased these
http://axiomaudio.com/epic60_500.html for my setup which will cost CAN/USA users US$3K. Now this for some will be a big sum, and for other modest...& each of us need to find a balance. FYI - I choose the Axioms as they fit the budget I was willing to commit and after doing some research managed to sift some of the facts from the pseudo science that infects this industry (sorry to all Bose Cube Lovers....but they do look good!). I'm not sure that there are many others in Australia who have imported Axioms but the Canadians seems to have a good center of excellence going on around one of their Universities for this stuff.
Right now I can see JimH laughing as Matt is curled in the corner wimping about the cost (but he will drop $500 on a GPU I've been told and that stuff only lasts a season or two!). Axiom's M60 founts are about US$1K but you may want to consider a L, C, R purchase one one mfr as with movies the front sound stage is important and mismatched speakers are not great with sound that travels from one side of the screen to the other (eg it has to move across all three speakers in a seemless as possible way).
There are some good options around, but the crap at the back of your shed is not one of them....even if you upgraded them with a mismatched $2.50 tweeter! I bet you even paid more for a set of Headphones!