Everyone will have their own personal favorite, so what I like you may not. Anyway, my personal preference is the Purdy All Paints 2 inch sash. It has been my experience that the all paints shed less than the Purdy Oils, but tend to hold less paint. Just ordered some new Purdy Clearcuts though on the advice of another local contractor and looking forward to trying them out. He made them sound like the bee's knees.
Let us know how the Purdy Clearcut's work--I've been eyeballing them at the store.