UUforum... just no. $0. (Whatever the acronym stands for should be the domain name) example: http://www.ukuleleunderground.com, the site itself has a forum as well.
LLsite... try getting the .com of the meaning of the acronym instead. The 'site' ruins it. $0.
I don't see much value in either domain name, not a big fan of repetitive letters in a domain name, especially the way you have it. But you never know, it may be worth millions.