You are probably going to want two bators, one for females, one for males. For that price I'd make your own. They are very easy to do and there are a ton of DIY threads all over the internet.
I use hovabators. They are 50 bucks each and hold ok temps. If you buy a good proportional thermostat to use with the hovabator then the temps should remain very constant.
DIY is the way to go otherwise, I use Little Giant incubators at $40 each and had 100% hatch rate, no reason to go out and buy a fancy one if it does the same thing as a cheap one. IMO