I am very happy with my Oppo 105, which I moded the incoming IEC with silver wire loom and Furutech IEC to the power supply board. That alone was amazing improvement,I then upgraded the OEM power supply to a Linear Power Module (both from Ebay) ~ $300 for both. You will be amazed. It is long know the 105s weakest link is the power supply
I also treated the tray with Machina Dynamica New DARK Matter, which I highly recommend to anyone spinning CDs ($39!)
Since the 105 has XLR outs AND VVC, you can connect it direct to your amp/s, which is how I do it
IMHO, try these and you will be hard pressed to get significantly better sound without spending a ton
You can find used 105s ~ $800 + the mods
hth