I have never been a fan of spacers, but I had to use them in order to run larger brakes. I was worried about the wheels vibrating, but haven't experienced any vibrations what so ever. I say go for the spacers.

I am running 1" spacers.

I don't have any experience with advans, but I ran A032R's a few years back and I loved them. I have heard that the 048's are great tires, but the price will probably keep them out of my garage.