Well, the Leopolds are nice, but there seems to be a newer, improved model coming soon so I see a lot of recommendations to hold off for the new one.
Filco's are as solid as they come, but I think their MX Red boards were a limited edition and are both expensive and more difficult to obtain.
WASD may be on the verge of releasing a board with Reds, or possibly have already done so.
Ducky has plenty of MX Red boards, including the Ducky Shining back-lit model.
And Noppoo is another option; I have a Choc Mini Mx Red board myself.
I'm sure I'm missing a handful of option some other members can fill in.
I have blue, black, and red boards and currently my favorite switch is Red. There was an adjustment period when moving from blue to red, but no real issues. That said however, I bottom out a lot on Reds. Not very hard though, and I actually quite enjoy the linear feeling ending with a satisfying 'clack'.