You are surely not alone with your enthusiasm for discourse and neither are you the first to wonder about these hosting questions. So, if you haven’t already done so, I suggest you search the #hosting category and you will find plenty of relevant topics. By reading those, you will get a sense for what to look out for when comparing providers (CPU frequency, for example).
Apart from that, I concur with @zogstrip’s advice above:
So if you ever conclude that you made the wrong decision, it’s really not a big deal to change provider. Besides, when it comes to scaling, virtually all providers let you scale up to a bigger plan without any migration.