My next upgrade: what's first

Hello all,

I recently got back into this hobby after some years of inactivity and am slowly but surely upgrading my system. I have the following new gear

- Mac mini + Benchmark dac3 for my ripped cd's.
- Dr. Feickert woodpecker with Jelco 850 arm and Van den Hul DDT II cartridge

The rest of the system has not been updated yet. I have:

- A project Phono box DS
- A Rotel RA-1062 integrated amp (between 15 and 20 years old)
- B&W Nautilus 805 speakers (I got these used around 16 years ago)

What do you think my next upgrade would be: speakers, amp or phono pre-amp?
My own guess would be the amp or the speakers. What do you people think?
Would appreciate your ideas.

Note that I am not dissatisfied with what I have, but if I listen at shows what's now available, then I'd love to be able to have that at home.

Danny.