I too don't plan to upgrade my Nottingham Spacedeck any time soon, and unless I am ready to go over $10k or so I would only upgrade to another Nottingham.
Theoretically speaking, if I had , say, $3000 for upgrades right now, what would I do? Would I upgrade the table, the arm plus cartridge, cartridge plus phono or integrated amp?
That would be tough. Probably either cartridge plus phono or the amp, also depending on opportunity.