K so I purchased a thermostat when I set up my tub for my snake, but now that I'm looking at getting more snakes I'm wondering if what I have is sufficiant.

I have the Reptitemp 500R right now, it was cheap and I know you get what you pay for, I was just wondering... Should I upgrade when I get a second snake? I've contemplated upgrading anyway because I don't like the dial that it has, its so uncontrolled... I purchased the thermostat to control temps and then my control is "Max" or "Min" with a colored sticker on it....

Just wondering what you guys think, is what I have going to be sufficiant if I had 3 or 4 snakes? And if not any suggestions on good ones that arent going to cost me an arm and a leg. My budget is really what ever I think is reasonable... I'd prefer not to spend 150+ but 100 dollars or so is fine.