I would say the ProAc sound generally. Obviously the Revels will give you more bass, but the ProAcs sound better. They are a lot of speaker for the money, and will surprise you with how dynamic they can be, and how much bass you can get for bookshelves.
I'd also look at the Avalon NP series. They're about 2K new. Maybe not quite as magical as the ProAcs, but you'll get more punch and more bass if you mainly listen to rock.
I'd also look at the Avalon NP series. They're about 2K new. Maybe not quite as magical as the ProAcs, but you'll get more punch and more bass if you mainly listen to rock.