I have just the loudspeaker for you and it's a boatload less than your $2500 budget. I've got a buddy who runs a vintage pair of KEF Calinda loudspeakers that he drives with a Marantz 8B power amp. This is one of the most pleasurable and thoroughly enjoyable audio systems I've ever heard, at any price. Really.
Your 500C is about 25 wpc and the Marantz 8B is 35 wpc, so they're in a similar power range and I feel would be a good match for the KEF Calinda. The Calinda and the Cantata were KEF's big loudspeakers back around 1980.
Being as old as they are, they're difficult to find, but when you do, they'll be priced at $500/pair or less. If you persist and are resourceful, you'll find a pair in a few months time. You'll probably have to spend some money on shipping as well, but given your budget, this is something you'll readily afford. You will NOT be sorry. Truly wonderful!
Your 500C is about 25 wpc and the Marantz 8B is 35 wpc, so they're in a similar power range and I feel would be a good match for the KEF Calinda. The Calinda and the Cantata were KEF's big loudspeakers back around 1980.
Being as old as they are, they're difficult to find, but when you do, they'll be priced at $500/pair or less. If you persist and are resourceful, you'll find a pair in a few months time. You'll probably have to spend some money on shipping as well, but given your budget, this is something you'll readily afford. You will NOT be sorry. Truly wonderful!