I can certainly respect your desire to be more formal than "Hey Snookums" in a query letter. Truth be told, I'm glad of a certain formality. But "I presently require the services of a good literary agent" isn't so much formal as it is annoying.
And of course, you don't even need to include this kind of sentence in a query letter. It's one of those things I take on faith: if you're querying me, you need an agent.
Other things you don't need to cover: you're a mammal; you're breathing; you're writing in English.