I got a Gmod server from here. Excellent service. The owner is willing to help you out all he can. Would certainly advice people to go to NeatNode.
This host is very good as he helped me develop my server and also fixed every lua error there was. He explained everything very detailed and I'm not the smartest person, but he managed to get me through the process, he taught me how to do loads of things like adding addons and stayed until I was happy with the server! I suggest you use this host because it’s reliable and cheap.