Well the key point of my idea is to have
2 boards only... ever.
(of course the admins will have an extra one, but that effects the very small minority of the total users of the site)
To be honest, I can't think of any customization sites that have just 2 boards... deviantART has loads, Deskmod quite a few, Customize.org just 1 (but not many posts), VelocityART also has quite a few, as does ArtUproar.
2 Boards really won't take long to check, just pop in the one you prefer... have a quick look down the thread list and then jump into the other one.