Ermm...each year I go to the local (free) one, then I have choice of two small/cheap festivals (or one day of an expensive one) or one big/expensive one.
I tend to alternate each year. This year all of Shrewsbury.
Last year was all Oxford.
Year before all Cheltenham and one day of Shrewsbury.

Was gonna do Sidmouth next year (1 or two days) but its looking less and less likely I can afford accomodation/transport food costs let alone the cost of tickets. So postponed yet again. Probably go for a smaller festival in a cheaper area/time of year.