First off id recommend ebay for gettin cabs n other guitar stuff! So long as you use a credit card your insured against internet fraud!
Id try any 300watt cab, JCM800, 900 or 2000s. Slanted first because it directs the sound upwards and outwards! I got a JCM900 slanted then a JCM800 straight. Be carefull tho, some are BASS cabs but for guitar. I bought a JCM800 one but it was really bassy!

Check out marshallamps.com for the specs