You are already there.
All the work done and the money spent is so you can hatch out really cool things so looking at two of the top line thermostats is the way to go. (either way)
I have my incubators set up with a HerpStat-4 just becasue I'm a little lazy. (ie, when I was building racks, etc I was ordering 5 HerpStat-4's anyway so I just ordered another for the incubators)
Nice thing about the HerpStat is that you can plug in the optional RH% cable and keep an eye on humidity and temp with one unit. (More intended to control a fogger if RH% drops, but it still works without)
You are right in that there are some bells and whistles that you might not need on a HerpStat so if you want to save a few bucks with Vivarium Electronic then you might as well. I have one VE-300 X2 and it does have temp control to 1/10th of a degree. If the VE 200 does also then you should be good to go!
Chris