Re: Flying Scot - did I buy the wrong boat?
I agree with bljones about your wife's desires. A small keelboat with a small cabin would be a good choice for several reasons. It's a great place to put a cooler, extra clothes, jackets etc. A small porta-poti for the kids. You may also get an idea if you want to grow into a larger boat for weekend cruising. And your wife may be more relaxed on a seat than the deck. Some shoal draft keel boats also have centerboards which help a boat go to windward better and they are easily trailer-able. Keel depth may depend a lot on the water depth in your lake and slip.
Check out Sailboatdata.com for specs on a bunch of boats. Some smaller keelboats are also great performers.
The only downside is that your kids will love the cabin and will try to talk you into sleeping overnight.