Lots of options. I would question if you can get an enclosed underbelly. The frame has lots of holes in it to lighten the weight; the lower skirt is very light weight too. Also if you add the enclosed underbelly you will significantly reduce the cargo capacity. These HTTs do not have a large cargo (weight) capacity.
2” suspension, very personal, and I think would depend on the places you want to go. I thought I would want it, but the dealer made me a good deal on a unit in stock, so I did not get it. We have never needed it. Once at a KOA we had a bad sewer hookup drain position. If you are thinking about a blue sewer tote, consider a Therford Smarttote
We went out and bought our own heated mattress pads. The only disadvantage to them is, is it you have to store that when you are not using them. If they are built into the mattress they you all ways have them and you only have to plug them in.
Power options; I think you can only get the 23B with an electric awning. I really like the looks of the new LED lights under the awning. That I would absolutely get, and I think that is standard. Power jack, that is very personal. I do not have one, for me it is no big deal to crank the handle, if I was 15-30 years older that might be a different story.
Grill, leave it at the store, and buy a good table top stove and/or grill. I have one of each, we utilizing a small 11 pound propane tank with a multiport manifold. We set it up on the picnic table and keep the heat and mess outside the HTT (easier cleanup).
22” TV, that is very personal. Personally, I removed it after our trip. We do carry a small tablet, for the kid to be entertained when needed. We have a number of movies downloaded to it. He only watches it when the weather is poor, or as he is falling asleep at night in his bed.