If you're looking for a combo you really can't go wrong with any of the Fender HR amps or the Peavey Classic amps (used market for either). Not 60 watts, but still loud enough for gigs. If it MUST be 60+ watts for the greater clean headroom then you're in a pickle. Not many amps make watts between 60 and 100 watts and 100 watt amps with channel switching = expensive and is usually a head and requires a cabinet. Most two power tube (big bottles) amps are making 45 or 50 watts. Back in the days of the watt wars there were more 60 (ish) watt amps and many claiming 60 today probably aren't.
If you already have a cabinet and are looking for a head then don't discount the usefulness of dirt boxes. Way more good tones have been made through pedals than most people know and today there is a range of really good ones (at additional expense). But getting the power and the clean tone you need within your budget is a lot easier if you already have a cabinet and don't mind plugging in a pedal. Most tube amps that aren't broken or known to sound bad actually sound pretty good clean. Used heads from lesser coveted brands like SUNN and Traynor are pretty easy to come by. Shop smart and buy local so you can try before you buy. Old tubes, filter caps, scratchy pots or defunct features should be avoided unless repairs can be handled after purchase within your budget.