#1. Get something that makes the wife happy. If she's not happy you'll never get your money's worth because she'll resent it and you for buying it... Then you'll have to sell it.
#2. You want more room than you think. Never put yourself in a situation where you have to convert a sofa or table to a bed. If you need 2 or 3 beds, get one with 2 or 3 dedicated beds
#3. Lighter means less durable in most cases. So many RV manufacturers are cutting weight to make more RVs half ton towable. That means they are going to fall apart every time you take it in the road.
#4. Know your tow vehicle. Payload is critical. A half ton can probably pull it, but when you tow you need excess payload for tongue weight, gear, fuel, and water... Having excess payload is what keeps you from losing control of the vehicle/trailer at highway speeds. My airstream is 7500 lbs dry and pulls perfectly fine with just a straight ball behind my 3/4 ton. You put it on a half ton you are going to want air bags/timbrens, a weight distributing hitch, and no wind if you want to go over 45-50 mph.
#5. Stear clear of stick and tins. They are not going to hold up to highway travel.
Brands I would consider for your scenario:
Airstream
Lance
Grand Designs
If you're more interested in dry camping out west and hitting the trails:
Outdoors RV
Black Series
Ember
ETA: I have pulled my Airstream for over 15,000 miles in the past 2 years. On some of the gnarliest roads and over the steepest passes (Teton, North Cascades). If you are planning on coming out here, 3/4 ton and slotted rotors are a must or you will destroy your tow vehicle brakes or lose control coming down the passes. Not a single issue other than a blown tire on Vancouver Island. It's an airplane without wings and will last 100 years.
That said, I would never own one in hail country unless I had an RV garage to keep it in. Insurance won't cover hail damage to an airstream apparently.