I have a 6 x 8 uth I could put under the tank too, but I was worried about them getting burnt cause I don't have a way (yet) to regulate the temp...
Smart move. You could purchase a $10 piggy back dimmer from the home depot. You will need a thermometer with a probe to do this though as the temps can still spike with the dimmer attached.
I can use plastic containers with holes cut in the sides as temporary hides, right? At least till my check comes and I can get them the right ones. Any recommendations? Are the heavier rock looking ones they sell at the pet store better than a plastic flower pot? I personally prefer the idea of a terra cotta pot with a hole chipped in, but this isn't about me.....
You can use them as forever hides if you want to. I use plastic food containers with holes cut out. I don't think it is worth it to pay for the expensive pet store hides. Nothing wrong with a terra cotta pot, just make sure it is low to the ground and not 6" tall.
I'd way rather go with the more pricey of the thermostat options you suggested at this point, I want it to last and the dial looks like a pia, does anyone have anything particularly good or bad to say about the Johnson or the Ranco? I'll do more research comparing the two tomorrow....
I use a Johnson thermostat and I love it, never had any problems. I don't think any one has had any problems aside from the occasional malfunction. But that happens with any piece of equipment.
A friend has some dial themometers I can have till I get my check, (I'll get two acurites then, almost everyone on every forum I've read recommends these) I'm out to pick them up tonight, so I'll let you guys know what their temps are to make sure everything is ok for now. He has some of that expanding coco bark stuff too, would that be a good idea to put down to increase humididty? Weather.com say's the humdity here is 39%, I haven't seen either of them shed yet so I don't know if that's a problem, but I assume it is...
Keep in mind those dial thermometers will be up to 10*F off. I personally hate the coco fiber. It is basically just dirt. If it is too wet it can cause scale rot and urine just disappears into its depths. If you want a loose substrate, go with aspen. Just not pine or cedar.
And any suggestions for dividing the tank? Is this really important? (Don't answer that, I know it is...) If I put one in a Rubbermaid tub (with air holes) he's gonna get too cold, right?
Well, yes it is important. They won't die if they are kept together, but they will appreciate the privacy. Putting one in a tub and in the tank, maybe perhaps over a UTH might work. You could always give it a try and see how it goes. As for dividing, a piece of dark plastic or even cardboard (replaced when soiled) will work.
And how soon should I try to feed them? No money issue here, I have rats.... Sadly I originally thought these snakes would be an easy addition, I breed for friends with snakes (who also it appears know nothing about bp, he thinks their fine with out a hide, their happy, always cuddling in a corner together... . ) Once I get all set up it I'll be fine, but right now I'm pulling my hair out with amazement at the misinformation!!! I went to the pet store to look at prices, etc and the employees didn't see why I was so concerned about my snakes, one told me it sounds like I already have a perfect setup.... Why is there such conflicting views out there?
Well, a lot of people just don't know. They don't do the research or they ask pet store employees, whom they trust, what they need. 99% of the time, pet store employees are wrong.

As for feeding, wait a week from the day you got them. Don't be surprised if they don't eat though. If they are full grown they can go many months with out eating so they won't mind a tiny fast until you get things all figured out.