Need advice for upgrading my analog setup

My experience has been that turntables require appropriately high quality phono stage to sound their best. While I have not heard the Darlington Labs MP-7 phono preamp, I have doubts that it would be up to the sound quality of your intended new turntable. My general rule of thumb is a very carefully chosen phono stage in the same cost range as the turntable. Whenever over the last five decades of me violating this I later found the Phonostage was significantly compromising the sound quality of my turntable.
 

There are many excellent used high end phono stages on the market. 

"I’m using a Darlington Labs MP-7 phono preamp that I’m happy with and don’t plan on replacing."

It will serve its purpose, but to get the most of the proposed setup, consider $3-5K in a "proper" phonostage.

You won’t go wrong with that setup!

It looks like you have done your homework. I would not mind you upgrading a notch to The Voice. Best high output cartridge made IMHO. 

@mijostyn - I had not heard of this cartridge but I'll look into it and consider it. Truth be told I'm not in a super huge rush so delaying the build a month or two to fund that cart doesn't seem like too bad of an idea.

@ghdprentice and @tablejockey - What are some worthy phono preamps in this price range to consider? It's possible I'll save that upgrade for further down the road to keep my upgraditis satisfied.