Get the full enclosure because this way the machine comes with faster rapids and a higher spindle max rpm.
Big coolant pump is a must but the programmable coolant nozzle maybe not. Just make your own multiple nozzle array.
Air blast make your own.
Rigid Tapping, Macros, Rotation and Scaling, Spindle Orientation and some other options can all be turned on for the 200 hr trial and then bought later if you want them. It is probably best to get Rigid Tapping at the beginning.
Fourth axis can be retrofitted, I think, so you don't need to spring for it up front.
I think you have a choice of the smaller LCD display which allows the floppy drive option or the large LCD display which allows the usb; you cannot have both usb and floppy. I don't have any suggestion here because we do not transfer or run big programs. The large LCD display annoys me in some ways because they have silly flashiness but some of the extra machine info on the screen can be helpful.
If the Haas training manuals you were given are in any way similar to the manuals that come with the machines just use them to prop up the leg on a wobbly table
. I find the Haas manual writers are very good at making things less clear than they should be.
If you have machining experience you should come up to speed quickly on the Haas control. My advise is don't even waste time learning their Quick Code or Intuitive (there is a laff!) Programming, take the handwheels off and just dive right in and teach yourself G-code. You might lose a lot of hair at the start but down the road you will be better off.