Hi,
think you also contacted @TTNEssen through Twitter, right?
For outdoor use, I would recommend this gateway: Lorix One It is not cheap, but I think it’s pretty solid and easy to use.
For indoor use, I am currently using the Laird Sentrius RG1xx and I’m quite happy with it.
For DIY gateways, there’s the RAK831 and the IC880.
I guess it depends on how much you want to spend, how much effort you want to put into it and where you want to place the gateway in the end. But anyways, welcome to the TTN community! 