Another vote for CS, I love it and even if you don't want to pay for the Tower, the other rooms are great.
I love solo trips and take them often, more often then trips with hubby. He hates to travel and isn't a huge fan of Disney. He will go with me but I know he's not enjoying it, we take our RV and stay in the Fort when he is with me, which means most of our meals are in the RV, I go to Disney for the food and not to have to clean. The entire trip I know he's not really happy to be there, although he never complains. Solo is just easier for both of us, he gets to stay home and do things men do when women aren't around, and I get to do what I want.
If you are going to go with the what one gets the other should too, didn't your daughter get a trip to WDW for her b'day? So, if you don't take your son, she did and he didn't. Just saying. I have only one child and was a single parent a good portion of his youth so can't really speak to it. I am, however, the youngest of six and the only girl. Daddy tended to do things with the boys, Mama with me. We all went to all the sports events as a family, all vacations (the few we had) were as a family.
You know your wife and kids better than anyone (hopefully) so only you know if she really is o.k. with you going solo and how your kids are going to react.