Autotrader should give you some AWD Sienna results. The only drawback of owning a minivan over an SUV is the "minivan stigma" and the off-road clearance. We have owned a 2002 Honda Odyssey since it was new and it's great for hauling things, kids, or pets. The interior is pretty beat up now, but it has only needed a new transmission back in 2004 for a free-fix recall as well as an airbag for a recall, a starter, an a/c blower, a 4th gear pressure switch, and normal maintenance in 175,000 miles.
What you don't get in an SUV is the 1 ft deep well in the trunk where you can hide things. When the seats are folded flat, it's great to go on a camping trip and load the trunk from floor to ceiling. And when they are flat, you still have 4 seats left over. In an SUV, it will be harder to lift things into the tall trunk because minivans have a low load floor. Sliding doors make it easy to open in a tight parking space. They are great for old people too. SUVs have less space in the trunk than minivans.
The 2004-2010 Siennas were the Lexus of minivans. They were smooth as butter and more reliable than the Odysseys for the most part. Sienna's the only AWD minivan as you mentioned. These minivans are the only used minivans you should consider, as most of them were bad.
With the Volvo you could be drowning in expensive repair bills, something unlikely with the Honda and Toyota minivans.
Odyssey is more sporty (drives like an Accord) and fun to drive than the Sienna, which is more floaty, comfy, and soft. Not fun to drive. Back in 2002, the Odyssey was the best minivan and was actually sold out nationwide, so that's why I didn't get the Sienna. Compared to my 2002 Odyssey and a 2004 Sienna, I am glad I went with the Odyssey, but I would appreciate more comfort. If you are older, I think you should go for the Sienna, especially because you go on long trips.