External DAC for Sony SCD-777ES

I do not have the Superclock. I believe it is two parts. A circuit board and a power supply for the circuit board. Is this a mod I can do myself or do i have to send it in? Does this upgrade only change redbook or also improve SACD?

I thought about the advice overnight.
1. Investing more into vinyl is an answer, but not the one for me. I am trying to get the CDs and SACDs I have sound better.
2. Superclock 4 sounds interesting. Gets the board into an existing unit. Improved both SACD and CD. However, it does not add any resale value to the player. As I looked at the web there appears to be several mfg of similar boards - LC Audio, Dexa etc.
3. External DAC. Ack!, PS Audio, Bel Canto, Benchmark, Theta. Better second hand value than 2. Only improves CD playback.
4. Buy a dedicated CD player. Basically only use the Sony for SACD. This is an interesting answer. However, I am concerned that $ 1,500 used will get me a CD player that beats the Sony. Remember the Sony is not bad. I am just looking to improve it.
Still thinking.

I am using the stock power cable from Sony. I recently bought a PS Audio Power Plant. It made a very nice improvement on the CD player. I have not tried to use a high end power cord. I may want to try that.

Sounds as the combo may be Super clock and a new Powercable.
Thanks.

Update. Followed the advice to buy the auction of a Superclock on Audiogon:
1. Super Clock 4 never installed and Audiocom Super Clock 2/3 power supply was used with previous SC versions. Power supply is used.
2. Will use a high end power cable.

I will do these two first. After I see the results, I plan to revisit the external DAC. My sense is this is big bang for little money and can't go wrong.
Thanks