Congrats on getting started!
I've never heard a bad thing about Tortoise machines, so you probably can't go wrong with those. You could save yourself some wiring by putting Caboose ground throws on the more accessible switches if you'd like.
Looks like a fun plan! The shape of your table would lend itself to a crossover in the middle for reversing options. You could also go vertical if you wanted longer runs and more interesting scenery!
