Should I sell my Oppo 205?

That's right; take the money and run by selling it to me.

I now used it as a CD/SACD transport to feed in a DAC for two channel music. Because it has USB input, I also play DSD file through it. As a transport it is a great sounding unit. PS Audio comes out their new SACD transport that can do what 205 does for two channel music, and it doesn’t have a streamer. It’s also at considerable higher price.

it’s a bargain at current asking price because it’s a great piece for both audiophiles and videophiles.

keep it! 

Don't try and sell it.  Give it to your son

Keep it.  It offers a lot of functional value which may cost you much more to replace.  I did not buy it at $1300 when available, missing a great opportunity.  When I checked used prices, they were outrageous and could not justified it.  I finally purchased a Wolf Audio Alpha and it was not inexpensive. 

I have the Oppo UDP 203 (multi-region) modified with a Kimber mains input which has been my main digital source since disposing of my Linn Unidisk player. Much prefer the Oppo eventhough the Linn was over 12 times the cost. The Linn dealer said that I would miss the Unidisk but .....
Pioneer make a multi format player but this is more than twice the cost of the Oppo and was not as well reviewed - so I would keep it.