Wow, thats some hard luck. I can't believe you're actually considering buying another one, thats some dedication. If you're concerned about money, why not just wait the 2 weeks for replacement ? Or you will have 3 of the same console... seems like a waste of money, and may be hard to hide from the wife once you get the other two back.
You could always buy one, play on it for a couple weeks until your other 2 get back, then return the new one... assuming they give full refunds anwyays.
If you want Blu-Ray then a PS3 is probably a good bet, particularly if interested in any of the games on it. Although I think you can get a stand-alone player for about the same price as 360.
Good luck with whatever you decide