The "Genesis Hovabator" mentioned is actually 2 different models of the styrofoam units manufactured by GQF Manufacturing (GQF = Georgia Quail Farm). The regular Hovabator is much like the LG (Little Giant), and about the same price. The Genesis is the digital version of the Hovabator and quite a bit more money.
There is another styrofoam incubator manufacturer, Farm Innovators. I've never used them, but they seem like a clone of the LG models.
Brinsea is a more "high end" brand, quite a bit more than the styro-bators, if you consider the capacity. In fact, some of them can rapidly approach the price of a cabinet incubator.
If you have the money and know you won't want anything larger, the Brinsea is probably your best bet. If you want to start cheap, I recommend a GQF Hovabator, in one of it's many different price points (Genesis being the top of the line in styro-bators).
Anything you get can be resold later if you take good care of it. So, if you don't like it or need something larger later, you can trade up then.