Avoid the EVOD2, Protank 3, most or all Aspire BDC/replacement BVC stuff as they use twice the power, 3 times the juice and often deliver less flavor in the bargain.
Another option would be a dripper. They leak immediately and profusely when not held upright unless almost empty or a lot of wick is used, but they are completely unaffected by heat except of course the battery probably shouldn't be worked too hard when it's 112 degrees.
You didn't cover cartomizer tanks.
BTW, I agree with you on the clearos. I have been vaping on evods and protanks and just out of curiosity, got a nautilus recently (late to that party I guess). I vaped the single coil evods and protanks, alongside of the nautilus and Protank 3. I was floored by the amount of ejuice that nautilus and P3 consumed in comparison. I have no desire to go thru 3-4x as much ejuice in a day than normal. I have pretty good tastebuds and gotta say, I really am not seeing a huge flavor difference with the juice hogging Protank 3 or the Nautilus.