I second Three Judges and Inn Deep in the West End. You can make a right good pub crawl of it from Inn Deep to Brewdog, there's another good bar next to Three Judges. Bon Accord has good selection also. In the City Centre, The Drum & Monkey, has about 5 ales on. Sloans, Lauders, The Pot Still (mainly a Whiskey bar)...Glasgow's pretty good for pubs!