It really shouldn't matter. Because in 10 or so games down the line, any possible advantage you would have gained would be unnoticable. Your rating will even itself out to where you belong.
Basically, I don't think you should be cruel to someone, and purposely delay a game just to get the 'most' out of your rating :P . I say play the games as they come. You win some, you lose some. And certainly don't worry about it!
Ok, I know that for the most part ratings don't matter much, and for the most part, I just let whatever happens happen. However, I am involved in 2 games right now, one that I am about to win and one that I am about to lose. Normally I do not have this option, but if I could choose, would it be better for me to lose the first game and win the second, or win the first and lose the second? Or would it end up the same regardless?
More specifically:
Would it be better to have a rating of 1412 when you defeat a 1538?
Or have a rating of 1535 when you lose to a 1542?