You should definitely listen before you buy. Your message didn't say what capsules you have on your 451 or 460 pairs. The nature of each capsule will change the sound. The best way to find out what the characteristics of a model are is to start by reading the information Neumann provides on another part of this board, then asking friends or colleagues who have experience with it, then getting a pair on loan or rent to listen to over a weekend. Audio Upgrades in North Hollywood brags that they have modifications to some of the AKG 451 line that will make them sound like Neumanns, if you want to try that route.