Favourite Shakespeare sonnet?

(First off, I browsed the 5 most recent pages and saw nothing of the sort, so please forgive me if this has already been posted...)

Well, I recently signed up for a Shakespeare competition, the contest consists or reciting on Shakespeare monlogue and one Sonnet. I recently took out a book of sonnest and find myself quite attracted by Sonnet 149. Its just very cleverly written.

So I was wondering what your favourite Sonnets by Shakespeare are, and maybe suggest them to me? It'd be betetr if they weren't so widely known as well.