You really should do as much GE as possible.
Fountains of Youth now have shrink kits and are available only in GE, and GE is still the best source of consistent diamond collection, even vs. 100 ww's.
Also, events have gotten much tighter on the number of ww's or shrink kits you can get from them in the last year. In my ww worlds I have pretty much stopped doing events altogether now.
You can create your own guild and do all of GE by yourself, you just can't compete in the guild competition part in a solo guild. Then there is no pressure to meet guild minimums such as GBG minimums.
SC is a great choice for negotiating, since ww's are a part of the rewards from negotiating with it, and is a great building to dump your fp into.
Sleigh builders are great for goods production, especially if left in the prior age since they are small and produce a lot of goods for their size.
So, SC and ToR would be my top pics.