I know its a bit early to be talking of clans and clan bases, but wouldn't it be just awesome if you could set up your clan HQ outside the last city, as outposts for other Guardians, and a place to store your ship when you're on planet. I would love to have a clan HQ on Venus or Mercury, some place a little out of the way and maybe even hard to get to where all of my friends can hang out in their spare time.
Of course, it would be even cooler if a Battle Cruiser could serve as a mobile HQ, but I don't think I should get my hopes up for that.
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Because of finite area to put them I'd be more in favor of an instanced area with a customizable HQ. Then you don't have half a planet covered in buildings and what not. Or even make them out in the world for everyone to see, but they're existing buildings that have an upkeep fee. The huge guilds/clans get to have an HQ and the little 10 members and under ones don't. If they add in an alliance system that would work out even better as the smaller groups get full access to their bigger allied base.