Don't do it. I might be crazy, the slim is cool and all but......I have seen several threads regarding members wanting advice or deciding to trade their current fat for a slim.
Here is my OP and it is simply just that,......... my opinion.
I personally think that my Fat is better looking, and higher quality than the new slims. You are technically trading in a perfectly working PS3 and paying 99 for 60g more HD space and a unproven new PS3 model.
What if you get a slim and the new models start having issues (the slim is new and fairly unproven). I am not saying it will have problems but you never know. So now, you trading in a perfectly good working console, and then paid extra for the same console, (smaller, less power, sure) that may or may not be working as well and is cheaper looking and cheaper made.
I dont know, maybe it's just me, but I feel the slim is perfect for new adopters.......not current owners. Unless there is some crazy bundle that comes out that gets you a couple of free games.