You're on the right track to get a separate phono stage and eliminate bypassing your AR line stage and using the McI.
You are asking a pretty complex question if you've got $20K total to invest in table/arm/cart and phono stage. IMHO, the Project is okay, but modest vs. your other gear, and an upgrade would better leverage your electronics investment. You need to account for many factors, each which deserves research and is usually discussed in separate threads:
- cartridges will be MM, HOMC or LOMC and whichever output level you choose needs to be paired w/ compatible phono stage
- cartridge's compliance needs to be matched to the tonearm's to eliminate audible resonance. Research "cartridge resonance calculator". To oversimplify...lighter carts on heavier arms & vice-versa, but not exactly
- pros/cons of ss phono stages vs. tubed. Many start w/ SS because the low signals from phono are much more noise-susceptible than other signals. RFI from radio, etc. are far more challenging w/tubed phono stages. OTOH tubed can be glorious in right circumstances.
- belt vs. direct drive tables -- a giant rabbit hole in itself.
Saw an ad pop today for SME20/Graham Phantom/Lyra Titan for $9K. IMHO this is a great deal that would WOW you with any decent phono stage.
Whatever you consider, be sure to confirm a number of users having reported success matching the cart with the arm, the output level of the cart with the phono stage. Cheers,
Spencer