why on earth are you trying to be near wolf/silver? Neither one is used after you have beaten the plains. I am just curious here, as I don't see any point for it. If you had said for cold arrows or something that is used after mistlands..???

That aside, my ideal end base...
- near coast with good travel. Not all coasts are great: some just have you dodging islands/shallows and taking long, long rides between useless but large islands.
- near as many biomes as possible. Not required, as you can portal, so if you have to pick and choose it needs to be near any ore you use in bulk (iron!) as the critical choice and anything else is scenery and nice to have. Another idea is a mistlands & plains split to build a farm in both of the key terrains, built right on the border, but that is going to be tricky to get near a coast too.
- needs good view/scenery
- defensible with minimal landscaping and aggravation

I think you have the right ideas. Talking unmodded game, the biggest two things are iron access and sea access for practical bases. But thanks to portals, any base with sea access is viable if you just want to go for beauty and don't mind hauling your iron a bit. Iron access is temporary anyway: the nearby supply is going to run out, eventually.