Is the MoFI UltraDeck wit the MasterTracker cart the best TT solution @ $2,499?

Of course it is not the "best solution" at $2500 

This is the price for a used coreless direct drive Technics 1200G released not so long ago, the GR version is even cheaper.

You can even spend your $2500 much better if you don't mind to buy some vintage tip top stuff like Denon DP-80, Technics SP-10mkII, Luxman PD-444 with tonearm of your choice and some decent vintage MM cartridge for example. Personally i am much more happy with vintage DD turntables, some of them are here. Luxman PD-444 is definitely my favorite of them all, i like it so much that i even bought two. 

@mulveling modern arm with 35g effective mass is something very strange, but if you will look at the MoFi MM cartridges specs you will see that compliance is from 8cu to 10cu for all of them, depends on the model. So these guys made some very strange low compliance MM cartridges in 2019 ? And they are not a Japanese brand to list compliance figure at 100Hz, right ? They are American brand, so it must be 10Hz compliance then. Very strange! If their cartridges are low compliance (8cu or 10cu) then a high mass arm is what they are made for, and this is correct. I’m pretty sure their cart and arm must be perfectly matched, so if the compliance of MoFi cartridge is 8cu then the effective mass of their tonearm must be very high! If the MoFi arm is heavy then vintage low compliance MC will be much better on such asm than modern low compliance MM from MoFi. If the mass of their arm is high then this arm is not optimal for most of the MM and MC on the market today.

I can’t recall any other low compliance MM cartridge, except for the Denon DL-107 MM from the late 60’s.