I own a Nature's Spirit, and personally would recommend getting a Hotbox over one of those. The build quality of my Nature's Spirit is not impressive and far from perfect, though for now it works. And Chris at CSerpents/Hotbox is a great guy to do business with.
That said, when I was only incubating a couple clutches, I used a standard chest cooler that was 20 bucks at the department store, a pre-wired strip of heat tape measured to fit the bottom of the cooler that I bought from reptile basics, a computer fan(also from RBI), and water bottles. Had 100% success rate with the hatchlings. I did use a Herpstat to control my temperatures, though, and highly recommend the brand. There are also a range of options available at: http://www.reptilebasics.com/thermostats depending on what you're willing to spend.
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