I do not have experience with the amps you list, but I have owned the N803's and will give you my experience. I used them with a Levinson No.383 and a BAT Vk200/Vk30, I also heard them briefly with a friends Plinius SA100 and Rogue 99 Magnum, all these were 'ok'. When I swithed to the Rowland Concentra II the N803's came to life, I find this an excellent match! I too was thinking of selling the N803's for ProAc's, but I find the amp change changed the speakers dramatically. You don't list what amp you currently have whereas we could state whether the ProAc's would mate well with it.
