Usual STW favourites list below with a few thoughts. I too have been to Dest-X and and had a great holiday.
White Room Chalet
Riding round area offers great variety, small village much like Areches. Was going to book there a year ago with my wife as a non-rider but she will need car to get out and about. (Trip didn’t happen for other reasons). Lots of variety up/down valley
Trail Addiction
Peisey-Vallandry has quite a bit to offer. Club Med is very nice but for guests only. Maybe you only looked round Nancroix where TA’s chalets are based.
Bike Verbier
Probably the Rolls Royce guided holiday, I go to the resort every year but not with BV yet unfortunately. Cost of 2x esp if one is a non-rider may be a bit high. Quieter in summer obviously but lots of great walking, lovely mountain restaurants/lunch/drink spots accessible on foot or by car (you can drive to La Madeline/Croix de Fer/Carrefour/Chez Danny). Some longer hikes using lifts/post bus. Sports centre with pool etc of course. Verbier bowl is a sun trap too. A few road ride options (or excursions by car) – loops upto village via Loutirier/Sarreyer from valley, Dam at Mauvoison, Val Ferret / Campex du Lac, TdF 2016 climb Martigny to Emmoson Dam. Martigny summer exhibition, Monteux 40 mins, Chamonix an hour away.
Bike Riviera
Coastal location could be great for the wife. Much longer drive out from the UK.