I have been eyeing a flattop for some time. My biggest problem continues to be not having a covered patio.

stinking mega millions...
Friend's got a commercial grade one from a restaurant remodel. After chiseling off the calcification and hours of cleaning that thing is amazing. Its about 4' wide and a solid 2' deep. Fed a group of 15 adults and about as many kids like a champ.
He throws a mexican cheese straight on it and lets it crisp up. No pico, no meats, just the cheese, and everyone devours it in seconds.
@Ron Swanson, I might have missed it, are you a professional (lang, flattop, plus at least one additional smoker), or 'just' the backyard BBQ king we're all chasing.