Here in the US, Patchwerks has become my favorite, with a tie between Control, Control Voltage, and Detroit Modular after that. Also one source I haven't seen mentioned yet is Juno in the UK. They don't have the widest selection but their prices tend to be pretty good on the whole. Unless there is some reason not to support them that I am unaware of, they can be a good option depending on the manufacturer you are looking for.