The PS3 is $299 now. The Slim will be available 09/01.
Positives? It's durable, free online, bluray, plenty of great games. It's a no brainer in my opinion. I still enjoy my 360 immensely but if I could only have one console it would be PS3 hands down. And now that the price is $299, it goes without saying.
Edit: Oh yeah, how could I forget BUILT IN WI-FI?