I use Simply Be mainly, occasionally Yours or Evans. None of them are great quality but Evans are way overpriced and pretty abysmal designs, the sort of thing your granny might design for your daughter
I havent really looked anywhere else as I didn't know anyone else does much past a 24 or whatever? Im around about a 28 on top at the minute (tho' my arse steadfastly remains about a 30+)