When talking about Y-adapters, you must be very careful. You can use a Y Adapter to connect your Oppo or source to multiple amps. However, you must never use a Y adapter to connect multiple sources to the same amp. The signal will feedback into the second source and fry the output stages of that source.
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That being said, I would say either Krell S1200 variation or a Bryston SP3. Both have slightly different sounds. Both have fully discrete Class A audio stages for both input and output Bryston has excellent bass, but it somewhat laid back in the mids and upper mids. The Krell will not have as strong/deep bass, but it has excellent resolution and attack - much more exciting in my opinion. The Krell can sometimes sound a bit bright/thin in some systems.
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That being said, I would say either Krell S1200 variation or a Bryston SP3. Both have slightly different sounds. Both have fully discrete Class A audio stages for both input and output Bryston has excellent bass, but it somewhat laid back in the mids and upper mids. The Krell will not have as strong/deep bass, but it has excellent resolution and attack - much more exciting in my opinion. The Krell can sometimes sound a bit bright/thin in some systems.