Need some turntable guidance

Hi,

I'm new here, so let me give you some background.

I'd say I'm more of a record collector than audiophile.  About 15 years ago, life happened and I had to re-purpose my dedicated listening room, so I put most of my gear in storage.  I now have my listening room back and I'm putting my system back together.

Here's what I have:

TT 1: VPI TNT 4 with TNT 5 bearing and flywheel, Eminent Technology ET 2.5 Tonearm, Supex SDX-1100 cartridge

TT 2: Denon DP-1250 with Magnepan Unitrack tonearm, Grado Reference Series cartridge

Phono transformer: Supex SDT-722

Preamp: PS Audio 5.0 preamp

Amp: Bryston 3B

Speakers:  Apogee Duetta II

The Denon was used to evaluate the condition of new purchases and some casual/background listening, so I'll probably leave that alone for now.

I'd like to "modernize" my system a little bit, but as a record collector, my initial focus is on the turntable.  I've been looking around, and seems I have several options.

1. Leave well enough alone, keep the table and arm as is.

2. Upgrade the VPI, I see there's an inverted bearing and platter upgrade available for TNT models, and sell off the current platter and bearing.

3. Sell off the TNT, and get something a bit less fussy as leveling the air suspension can be a bit of a pain.

If I sell, I'll probably want to keep the ET.

I'd appreciate any guidance I can get on this.

Thanks,

Ctor