I am looking to upgrade my amplifier and want to spend $800 to $1200. If I go with an Reciever/amp I will spend $800 on something like this Onkyo . But would be willing to spend closer to $1200 on a pre-amp&seperate power amp if it would result in significantly better sound. Are there and good options for a pre-amp&sep system in the $1000 to $1200 range? Would it be worth it over the onkyo, or a similar Denon?