4 Options... Help Me Out...

I have helix, ranco, and herpstats and I like the herpstats the best as a proportional thermostat.

For an on/off thermostat I like the ranco but have never used the johnson one.

Let us know what you get and how you like it!

I have Helix's and Herpstat II's. I purchased the Herpstat II and not the pro because it can carry more wattage than the pro.
Both of these t'stats are excellent and I would not use a Johnson or Ranco for anything even though I have heard that Johnson's are superior to Ranco- but like I said, I have no first hand information.
Reptile Basics sells Helix's and also takes credit cards.
You can order Herpstat's straight from Spyder Robotics and use a credit card. Both places have fast shipping.