I've always found DB* and HOTT too generic for Fantasy and I like the buckets of dice approach. I'd go with Armies of Arcana, which was originally intended for 15mm but was taken up by the 25mm fraternity and gained some popularity. It has the same general feel as Warhammer but a slicker system, and if like me you have a chronic tendency to roll low dice then you'll prove lethal in battles.
It also has a points system allowing you to tailor the stats to whatever models you have. It also does not require you to rebase your figures which is kinda handy in 25mm certainly...