Right about now, Johnny Rzeznik and his Goo Goo Dolls should be somewhere around New Jersey. But in less than a week, the Buffalo band will be back in Boston, which Rzeznik swears is one of his favorite places to play. He's not just paying us lip service, or plugging his show. To prove it, he told us about one of his first shows in the Hub. It was at the Channel, the former stomping grounds of Boston bands from the Cars to the Mighty Mighty Bosstones. "Boston's a great rock city," Rzeznik told us by phone the other day. "I always remember the first show at the Channel. That was awesome. That w