I live aboard in Waterford Harbor. It is one of the more expensive Kemah marinas. I pay $330/mo for a 35' slip plus $70 liveaboard fee.
I picked it because:
1. I am allowed to live aboard on a 25' boat
2. It had the nicest bathrooms out of all marinas meeting qualification #1
Portofino Harbour and Blue Dolphin also allow 25' liveaboards. Portofino was a strong candidate for me. Similar price range. Blue Dolphin is much cheaper but also much dingier IMO.