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

The SOTA COMET V !
https://sotaturntables.com/products/comet-v/

actually for that money get a refurbished SOTA Sapphire, decent Jelco arm and an Ortofon Black and whale on the Ultradeck....just my buck fifty.....but yes, I have heard the Ultradeck many many hours with a Bronze, and yes it is good....

Best at $2500? That depends on your needs. I demoed the P6, 1200GR, and UD. I could have lived with any of them, but the UltraDeck is what lives in my system now. 

If I was a cartridge swapper, the GR would have been a no-brainer. 
If I was willing to commit to the simplicity of Rega and stick with Rega carts as a "set it and forget it table" then I would have ended up with that one. 
I liked the flexibility of the UD for various carts down the road, and I preferred the sound of the UD vs GR in a demo. 

There is no universe in which that tonearm has 35g effective mass - that would make it the same as known heavyweight Fidelity Research FR64S with its monstrous 20g stock headshell. I think you can safely consider that listing a misprint, and assume this arm will work with most cartridges on the high side of medium compliance (most MM, and higher compliance MC carts). 

@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.