Hey np, unlike some others that you'll run into while I do think we need to post in the right area, I don't think that should stop anyone from getting an answer if its known (IMG:
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I have a Xbox 360 Slim as well as a regular and in all honesty the only difference worthwhile is the (much) quieter operation and smaller footprint. The single fan and quiet heatsink is great to me.
However, when I can get an old style Xbox 360 that I can easily flash not to mention take apart in a few minutes it pretty much guarantees that I'll be getting cheap old Xbox 360s for quite some time. Even once the Slims become flashable likely by around the end of the year, it's hard to beat getting an older console for ~$100 as opposed to $225 for a 4GB Slim.