I have a Eureka Copper Canyon 10x10 which I like. It has steel and fiberglass poles, which make the tent heavy to carry when packed, but the wall are nearly vertical so I can stand up and stretch in it in the morning, or change t-shirts standing up. I hate having to change clothes while lying down. And because of those steep walls, it needs to be staked out well if there will be high winds, but it is a strong rigid tent and doesn't do that flopping around in the wind thing that dome tents do. Discard the cheap stakes that come with it and get a couple packs of the Coghlan's 9-inch Y-stakes and 50 extra feet of 3mm cord. It could sleep 5, but really just 4 adults with duffel bags, and it is great for two with cots and a week's worth of gear. It is small enough that it usually isn't hard to find enough level/flat space to pitch it. Don't underestimate the difference in usable space between a dome tent and a tent with steeper walls, even if the footprints are the same size. Really the only problem is that it would be hard to get the rain fly on without a helper due to the height. I think they run $200-220 new. The lower seams come well taped from the factory, and you can seal the rest yourself if you think it is needed. There are smaller and larger sizes of the same tent.
I've read a lot of negative reviews about the Coleman instant tents, but I've never used one myself. They are very large when packed and very heavy.
I agree with David about two tents with kids, especially if there are two adults. The kids like having their own secret space, and you might like having yours. They can also learn to set up their own tent.