I agree with Tweek a guild run server should be run from a guild forum. I think those 'a feared' of guilds are a very small number of fans. I doubt being unaligned means one is OPPOSED to guilds or thinks poorly of them. So, this may be too much concern.
I disagree that openuru.org is the logical choice. It is a new and clean forum, which is nice. The operator JWPlatt is pretty well known so I think we know the type of moderating we have. So, it is NOT a bad choice. It's just another new forum.
Since clutter seems to be an issue for many... Consider. The UO Forum home page currently has 5 sections and about 25 topic categories. MOUL has 1 main section (for most - search used to reveal a hidden section) and about 15 topic categories. I think UO is better organized than MOUL. GoW has 4 sections and about 21 topic categories. GoW is nicely organized.
I think any new forum will clutter up over time. I think UO and GoW have to learned to organize. I see GoW and UO as the better organized sites (of the 3). OpenUru.org is too new to know how that will go but there is no reason think it won't be well organized. But, clutter is part of life on forums, which is why I made an Uru Search Tool I also think UO will create a section for such a project if the guilds choose to go the neutral forum route.