I think they both look nice, i like the matte finish on the PS3 Slim, it just looks a tad square to me. However i would still have it in preference over my 80Gb, because it's smaller, doesn't attract finger prints, bigger HDD, Improved Cell Processor at 45nm instead of the 80gb's 65nm,and it uses less power.
I think this is the best decision Sony made about the PS3. They are getting there game together now, prior to this it always seemed a lacklustre effort in making the PS3 successful. But now the PS3 has a good price, a new and improved slimmer model, a extremely accurate motion controller coming up (if the sub-pixel tracking is to be believed), the best game lineup of any console ever in my opinion. GT5, GoW3, Uncharted 2, ModNation Racers, MAG + loads of amazing multiplatform games, a new and improved PSN. I think they may actually see the PS3 doing much better now than it has before this. It deserves it too, the PS3 has always had so much untapped potential!