Sorry for falling asleep (literally).
I have gone through all the circuits, and I have to say, there are some really good designs.
Runner-up is Prisoner Monkeys. His circuit has a variety of different corners, and all in all adds up to be quite handy. The track is has a very flowing nature, and fits together quite nicely.
And the winner is @matt90 !!!
An absolutely fantastic circuit. It’s long, it has character and its own personality. There are some very fast, challenging corners, and some very good overtaking spots. Also, the circuit has a very natural flow.