$5-7.5k Upgrade Recommendations

My current rig is a Basis 2001 turntable with a Hana ML cart, Electrocompaniet ECP-1 phono stage, Macintosh C2200 and MC2102 amplification, and Platinum Audio Reference 1 speakers. My music library includes hundreds of 1950s-1965 mono LPs and a couple thousand stereo jazz, rock, classical, and folk LPs. I am leaning towards investing in a second turntable with a mono cart (e.g. Technics 1200G, Ortofon 2M Mono SE and Graham Slee Ascension Phono Pre) to have a dedicated mono vs. the Mac's mono switch. What recommendation would you make to invest $5-7.5K in upgrading this system to improve transparency, dynamics, and sonics?