I really wouldn't jump to any decisions about parting with any of it. It doesn't owe you anything, after all.
I'm sure that you may be excited by the Garrard/SME combos for now, but you don't know where that may lead you. It may be that you'll want to eventually reintroduce it back to it's life-partners once again, just because it feels the right thing to do. And if it was me I think that's what I would do most certainly. These guys have been holding hands for 50 years and it just doesn't seem right to not respect that. I'm not saying that they shouldn't be used with anything else, but they do belong together in some way.
Even the Leak speakers. They may be last on the list, but they deserve the same respect.
I wouldn't see this in terms of cost and worth. Something happened to make these items sit there forgotten avoiding the builder's skip until you came along to rescue them. Maybe I'm over-sentimental about these sorts of things, but they waited until they could be found by someone who could give them life again, and against all the odds they managed to find you. You have to accept that responsibility and parting with any of it, at least until it's future is assured, would be tragic. It shouldn't have anything to do with money/assets/cost. They are your children now.