I would be a great setup...only thing is, you can't buy Lehners at the moment.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens
I would say go for a quark over the kontronik, just because of startup and warranty issues. If you are only going to use 5s the quark is the best, next to an mgm. I use a quark 80 with an aveox motor in my tekno revo and the combo is great, stays cool too!