Between the Lite and the VTC Mini, I'd have to lean towards the Mini. Half the price, far better display, uses essentially the same electronics, with the same materials made by the same people. While the customer support with the Lite will be much, much better, and the ergonomics are slightly better, that price difference is a bit hard to justify.
Moving up to the Stout, the price increase is a bit easier to swallow, due to its increased flexibility (18650 or 26650, more wattage), and I think that the ergos on the Stout are superior to the VTC Mini or Lite.
Finally, the Classic is a poor choice...not because it's a bad device, but because the Joyetech also released the Cuboid and the iStick TC100, once again at roughly half the price.