I'm not quite sure what you are looking for, no matter where you go, there will always be people stronger than you, if you start in one of the S1000+ servers, you will be out of the S14-S999 cluster (not actually sure what the last one is for our region), but the Sage Fields are very small, so there is no chance of avoiding the larger spenders there. S2-S12 have their own cluster as well, but it has been long established and I'm not sure how active the lower tiered Sage Brackets are, so you might run into the same situation.

In total, there is no way to avoid people who are stronger than you, the only chance you have is to spend more money than them, to become stronger than them. Sorry that there is not much anyone can do to help you.

The last bracket is continuing to expand as they create new servers. There is no sign that the cluster will be ending with any given server. S1344 is just the newest server in that given cluster, any new servers that are added to your region will so be joining that cluster.