Andrew:
With the ages of your children, I'm thinking that you will spend more time at the Magic Kingdom than Epcot. With that in mind, I'd recommend considering the Magic Kingdom resorts of The Contemporary, The Polynesian, Grand Floridian, Wilderness Lodge or Fort Wilderness.
Let's use the process of elimination....
With children, I always recommend a hotel with some theming, so let's mark off the Grand Floridian (unless you will be there at the end of November. It has lovely Christmas decor not to mention a life-size Gingerbread House in its lobby). And theming strikes the Contemporary, too, leaving the Polynesian on the monorail. A Magic Kingdom view at the Polynesian offers both theme and monorail, but transportation comes with a price. If you're watching what you spend, a garden wing room at the Contemporary would be the least expensive way to access the monorail, and your son will think a subway going through the lobby is awfully cool!
If we're looking at price, I don't want to snub another great option: Wilderness Lodge. A standard room there is almost half the cost of the Magic Kingdom view room at the Polynesian.... In a few years, your family won't fit in the standard 4-to-a-room accommodations at the lodge, so it might be something to take advantage of while your 2-year-old can sleep in a crib.
Although the lodge doesn't have monorail access to Magic Kingdom, it does have a boat--another attraction in my eyes. November's cooler weather makes the lodge theme fit (especially with its stories-tall fireplace in the lobby). If the weather is warm, you can still enjoy the pool, one of the best on property. Explore Wilderness Lodge
here and if you want to dig a little deeper come back to the panel, or my bio, and ask us some followup questions.
Wishing y'all a magical vacation!
Whitney