first off, i hope this goes in this forum!

i'm going to be ordering a CB-70 rack from RBI, and i need to get a thermostat for it. i've never used one before so i need some suggestions on which one would be best.
first let me say, i would like to buy one that i can hook other heating systems to at a later date. i can only buy one rack right now but when i buy more (another 1-2 of the same rack) i would like to be able to plug them into the same thermostat.

here are 4 thermostats that i thought sounded right for me..
http://www.reptilebasics.com/Thermostats-p-1-c-250.html

Double Ranco ETC-111000 Pre Wired

Johnson Controls Thermostat-Pre Wired With Night Drop

Johnson Controls Thermostat-Pre Wired

Helix Controls DBS 1000 Proportional Thermostat

the first 3 say that they are pre-wired, does this mean that the helix is not? i'm also leaning towards the first 3 because they come with a 6 outlet power strip. does this mean that i can hook up 6 heating units to this? i'm sure that would be more than enough for the 3 racks i want to end up with.

if you can answer any of these questions please let me know! i'm very excited to finally be getting a rack and i want to make sure everything goes smoothly.

thanks,
edie