Recommendation for phono stage

When I had a Cadenza Black after a lot of experimentation I settled load impedance at 200 ohms.  If you are happy with that cartridge you might want to rethink your budget for a new phono stage though.  There is nothing wrong with what you suggest it seems to be over kill is all.  With that said the MoFi would work well and would certainly be suitable if you later wanted to upgrade your cartridge to something like a Per Windfeld or even higher in the Ortofon range.  Another option might be a Little Loco from Sutherland, not quite as expensive and very good sound.  A word of caution, check compatibility with your cartridge this one is not a universal fit.  Finally a favorite of mine is the PS Audio Stellar, a very flexible and neutral sounding phono stage.  The company often offers refurb units at substantial discounts.

Transistor or tube phono stage ? That's the first question.

Sutherland phono stages are usually very good but they might have very high output impedance and will not be electrically compatible with some line stage preamplifiers. I had this kind of fun with Sutherland designed Acoustech phono.

There are many excellent phono stages for $5k, both new and used, it is hard to advise.

I would split your budget and get an SUT and a phono pre. 

For what it's worth, I'm running an Cadenza Black on a SME 309 arm on my GAE & going into a ModWright 9.0. I can change the impedance on the fly to dial in with any LP thats on my platter.

I never load under 100 with this cart & sometimes @ 250, all depends on the recording on the disc. Hope this helps.

Yes that’s very helpful. Just getting an idea of what phono  stage would be a good match for that cartridge and what load is the sweet spot is what I’m looking for