I like Amention.com, it fits IMO but usually "a" doesn't make sense or sound good before a word.
" The" is solid to me if used right; theChew, theShack, thedeal, etc
Article wise theCow is better than aCow. But aCow happens to be a 4 letter domain so that adds significant value and makes it much better than theCow in general..
I don't have much of those names: but off the top of my head,
I own
TheBigot.com