As John said the support from Marlin is 4-6PM. But I've manged to talk and get some advise during the day as these hours are no good to me.
Depends on the model your thinking of to the level of support from the people on here.
Turbo - Good support
Rover K series - Good Suppprt
Honda Type R - New so not sure
But the rest of the build there should be plenty.