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

I have it, and can't say if it the best at that price, but it make me smile every time I place a record on the platter and make music with it.  Zero regrets.  Zero.  

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).