I agree with everyone above. You should probably take a new tone to your ending altogether. You need something that is suggestive but not over-the-top or heavy-handed like your previous ending. Maybe you should try something like "I look forward to your response," which indicates that you are waiting and also implies a good outcome (because who the hell looks forward to getting rejected?)
Being generic might not get you any goodie points, but maybe that would be a better mindset if you're stuck on your conclusion. You can be blunt and straightforward in how you feel, and while it may not be impressive, it could still contribute to the rest of your statement, which is what matters. So, you want to state your confidence, so just go ahead and say "Given my <list your strengths or qualifications>, I know I would make an excellent addition to the class of 2013, and as such, I await your reply with enthusiasm." It's pretty generic, and the ending won't woo anyone, but at least it refers back to the rest of your statement which is where you will be hitting them with the good stuffs.
A lot of it is just tinkering with the phrasiology and vernacular, playing around with the synonyms and the thesaurus while rewording phrases that ultimately have the same meaning. And in the end, you might end up redoing whole paragraphs or the entire thing. Don't be afraid to mix things up or redo things. Personal statements take a while specifically because there's a lot of fine-tuning and revisions.
But, uh, in short, I agree that your original conclusion is too heavy-handed. It sounds overtly presumptuous, condescending and arrogant. If we're reading between the lines (and I can't imagine why someone wouldn't read between the lines), any real applicant feels that they're qualified for the spot, and now you're telling them that picking someone else is the "wrong" decision. I don't think you can make that sort of call.
--Garfield3d
