I've a soft spot for UK1 The Sentinel and UK2 The Gauntlet. I ran those as a mini campaign, so there was a lot of alteration on my part, but I ran it for two different groups and it was much loved. I know there are some "issues" with them, but for a crowdsourced re-do, expanding on a the sentinels region and adding some more sandbox elements goes a long way. Plus, how cool it is to get a sweet keep at the end of it all?