If you already have an AC Infinity controller why not just get their outlet plug and set it up for the heat to turn on and off at whatever temp you want. I use one for my humidifier...
I've used Greybeard seeds, Multiverse Beans and direct from Mephisto Genetics. I've had good luck with all 3. Fast shipping and nice freebies from all 3.
Have you ordered direct from them? They give a bunch of freebies and ship from the states. Everything I've grown from them has been very good. Their Double Grape is the frostiest plant that I've grown so far.