Boss, there are lots and lots of ultras around. depends really on what type of thing you like . hilly? flat? point to point? loop? laps for the security of having kit in one place and not carrying stuff? or one with minimal support and a few aid stations along the way but you have to carry mandatory kit (water,whistle, map, phone, first aid ) etc.
I really liked my first ultra which was northants ultra. very low key, very friendly ( but all uiltra events are!) im doing it again next year too if im back from hols in time .