The other item i have my eye on beside the yammy cr 1000 is a hafler dh 200 for 200 dollars that has had these upgrades by original owner.
Keep in mind i know very little about these things, so i guess im asking if something glaring still should be done or inferior parts were used, here goes.
1 Higher capacity power switch
2 Added inrush current limiter
3 Upgraded Main filter caps with better quality and higher capacity.
4 All electrolytics w. Nichicon and Panasonics
5 Mylar caps to the electrolytics in signal path
6 rca jacks w. gold plated
7 Heavier grounding strap between filter caps
8 Driver board transistors w. matched set to bring DC offset to 0
If any judgement can be made from this info, please share, obviously, the quality of soldering, etc. cant be known right now, but whatever you can share would be app.