Based upon the type of projects you do what FPGA would you combine with your Ard

I can't answer exactly but recently I designed a board with a Lattice MachX02-2000, that's 2000 LUTs and I figured that was enough.

With that chip you can do a UART for example with 600 LUTs I think.

But I have to say I'm not that up to speed with FPGAs these days, and the MachX02-2000 has the same pinout as the 7000 so I had an out if I ran out of logic.

Rob