You probably won't like what I say so sorry in advance.
But what on earth would ever possess you to buy a slim 360 when your phat version would have RRoD many times before you got it. I really don't understand why you would invest more money in a platform performing that bad for you to begin with? What did the 360 have that you felt compelled to go through all this trouble to begin with.
I bought a launch 360 in april of 06, the thing RRoD for me 3 days later while playing oblivion, took it back got another one it RRoD the next day. I took that back got my money back and didn't put a single penny into it until there were positive reviews out of re-visioned hardware that stopped most the RRoD issues, and even then I only bought a new system on a huge discount, and it didn't RRoD on me.
So what I am really getting at is I hope in the future for your own sanity, you think twice about what you buy, its people who do this why the 360 was crap when it launched to begin with.