Ok, thank you everyone for your input. I went to the dojo, and observed a class tonight, and I found it very very different then any I have looked into before.
First off, when i walked in, everyone was stretching (expected that), and after a bit, someone noticed me watching and she came over and invited me in. They finished the warm up and started the class. It was pretty easy to tell who had been in the class and who was new right off. The instructor showed a example then everyone paired off and tried it. He only interfered when you had a mis step then he slow the pair down and showed them the correct hold, grip, steps... whatever and then let them go again.
The hour I was there they only worked on three moves, but they worked at them hard. After that, the instructor came over and introduced himself, and asked me if I had any questions, and we talked for a bit. it seems that in the traditional Aikido, there is no beginner, advance break out of the class. Everyone works together, reguardless of level. He warned me that the first few months are a bit furstrating for that reason, and that moving up levels (belts) took quite a bit longer then other MA. They way they are able to keep the group together like that is the speed at which you attack (as the aggressor) decides how the fast the move is, and if the person is new and just getting the move, he will slow things down, simply by stepping back. It sounds weird, but watching it, it worked very well. The balance and general fitness of the group, especially the people that were older then I am, was impressive.
So I am going to take my friend up on his offer, and try the 16 weeks. As the same token, I am going to look at other Dojos (thou we truly only have 3 in my area). Hell if I can get back some of my balance, and loose a few pounds of fat, AND it gets me out of watching the kids a couple of nights a week, I got nothing to lose