If you just want a receiver and just listen to music definitely keep your old Onkyo Receiver. It was made for playing music and since yours was the top of the line no current receiver except for maybe the top NAD or Rotel 950 will beat it. New receivers are digital and made for home theater, not music. They are all computer chips etc. Your old receiver has capacitors and the older technology still used in audio power amps made today. I agree with the interconnect comment. Try Nordost Solar Wind or Van Den Hul PB5-HB or D102Mk111. If on a low budget try Straightwire Chorus. I am NOT a big fan of monster interconnects. Monster rip off. Also try a budget power conditioner. Monster Power is OK here. My recommendation is VansEvers Super Companion which lists for $150 but can be had for $129 on one of the VansEvers' web sites dealer links. If that is above your budget get a VansEvers Companion which sells for $25 to $30. It will improve the sound because it does nothing to the sound, where most cheap power strips ruin the sound. Skip the Adcom ACE515 it is over-rated.
TO upgrade or NOT, that is the question!
I have an old Onkyo Tx-7000 90wpc. reciever that is 15 yrs. old. This was the top of the line model at that time. My question is would i get better sound quality from a newer integrated amp? I just listen to music cd's, no ht or surround. My system is Klipsch reference 3 mains (98db.) and M+K V125 sub. Listening area is 14x21 Cd player is Sony CDP-CX210 (kinda cheap but i like it). Speaker wire Monster 12 ga. time correct, Monster Interlink 400 interconnects. Here's the kicker, i only have $500 to $600 to spend. Please give me any suggestions that would be helpful. I'm just a novice looking for advice, Thanks Please list make and model #'s if you have integrated amp suggestions please