Congratulations on your purchase! There are other posts on the forum that speak to the "what to have and what to leave off" options, but here's what we found. Oh, and like Sokol, prior to purchasing our 19', we had never owned/towed a trailer before.
We have solar (95W) and it works great. Our camping doesn't usually include "boondocking"; however, camping off the grid in Yellowstone last year for five days, we had more than enough power .
Have the U-shaped dinette and love it. While in Yellowstone, we had one evening of heavy rain and we were able to seat four adults and two children (tucked in the corners) while playing board games. The table slides in and out to allow access so, when the table isn't being used, you can slide it in towards the back which gives you an inch or so more floor room.
We installed satellite TV and wish we hadn't (reception is always "iffy"). Now we watch DVDs or use a Winegard Flatwave Anenna (Winegard FlatWave HDTV Antenna - Best Indoor Antenna
) which actually works pretty well.
Have the cot and have utilized it several times. We are very strict about "no jumping" so have no issues there. (The cot holds up to 200 lbs.)
Purchased the three burner stove and probably didn't need it. Two burners would have been fine. Do like the stove cover as it gives me extra room and a place to dry dishes. Don't have a microwave and don't miss it. That said, if we ever get a larger Escape, we'll probably install the oven ... just because.
Living in California and not really planning on much snow camping (but we did have snow in Yellowstone ...), we didn't get the heat pads but did opt for the extra insulation and thermal windows. We find the trailer easy to heat up and also to keep cool (especially with the Maxx fan)
Other options we're glad we have: storage box (a must IMHO), extra tail lights, digital thermostat, opening windows in kitchen and bath, surge protector, LED light package, outside shower, exterior access doors, extra light switches and extra 12V outlet.
Options we could have done without: the two LED lights over the dinette (it's bright enough without them), some of the reinforced walls (it does add weight), exterior propane quick connect (we purchased a 5 gal canister).
I'm sure you'll be pondering over your build sheet right up until you turn it in ... we've all been there. We'll all be waiting for your weekly build photos and hearing about your fabulous trips in your new Escape.