I was searching OfferUp and came across a Marantz 8003. I’ve never had separates before. Currently I have an Onkyo 805. I like that the Marantz is supposed to have a warmer sound and this one is ultra2 certified so it should have the thx listening modes in used to. I figure for 4k I can just pass a separate hdmi to the TV if I ever upgrade my tv to 4k later. The price doesn’t seem bad, but I have no idea how much a matching Marantz amplifier costs. I currently run 7.1 and no plans for any additional speakes for atmos or anything. Do you have any recommendations on an amplifier and about how much it will cost for a 7.1 system?