[quote user="the record spot"][quote user="raypalmer"]Speakers. The biggest difference is always speakers.[/quote]
I disagree; I changed my amp to the present one I have (listed below) and the difference was night and day from its' predecessor. The speakers have been constants, but by far and away it's a stretch of the imagination to only think that the biggest difference I could've made was to change the speakers.
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I agree with the previous posters, though it does require a certain minimum standard from your other components - given your system now, I'd expect that, for example, changing your player or amp would give you marginal benefits, while speakers would give you big ones. Agreed though that you need to have the first two sorted in the first place.
Edit - this was specifically to record spot, as opposed to the OP, but my view stands for him as well.