I would say that my all time favorite is the "Rubber Stamper"
Lately, I have been enjoying the new "CardMaker" magazine too. I also subscribe to "PaperCrafts", some months I like others are just okay. I think it all boils down to your own personal taste and what you are looking for. I recommend that you go to a bood book store with a huge magazine selection, buy a few of the different mags mentioned here and see what ones you like!