Just found this thread/post. If it's not too late, here's my thoughts...
First of all, you are a WONDERFUL spouse. I can't think of anything more thoughtful and loving that what you are doing here. Please follow through and make a purchase. And then help him assemble it. The fact you researched and made a choice will mean a lot to him. If it turns out, he really has informed (and strong) opinions and prefers something other than what you chose, it should be easily returned in the box. (Analogy: many bride-to-be's exchange the initial engagement ring...but don't all women prefer to get proposed to with some ring, not just a check?)
I think a pellet grill is a great choice. Yes a Weber kettle does a lot, is basic while still making good food, but a pellet grill is definitely a step up without getting into all the time-consuming wood-tending fire tricks of offsets and traditional smokers. You didn't mention a budget, and perhaps cost is of no object to you, if so RecTeqs and others at the $1000 and up price point are premier/prestige items. I'm not in that category and if you're not either, $400-500 gets you a perfectly good pellet grill. (Even better Deals can be had, but usually not going into the summer like now.) At that price point, all the essential, and admittedly lifetime-limited, components of the pellet grills are pretty much equivalent. The brands you mentioned are all goood. Just get one at least as big as what you think your min needs are, and then the weight of the darn thing is a pretty good gauge of the overall quality.