If you really have your mind set to use glass consider that unless it's scientific grade pyrex rated, you will eventually crack it pouring boiling wart over it. The demijons mentioned are wide based with a narrow neck and are used for making home made vino. You can get them in both 34 and 54 litre with taps, but the taps are plastic and connect to a glass spigot protruding from a concave base. These are expensive and difficult to clean. I have used carboys but prefer the european style pickling demijon - they come in 34L and have a neck large enough to put your arm down. The base is not as wide and offers excellent head space for more active brews. They are shaped like a pear and you can't get or attach taps.
Vin