I agree with much that has been aforementioned.
If speakers please you build around them. They are not a difficult load therefor offering many choices toward amplification. I would 1st purchase a line level integrated amplifier at 50-100wpc. After appreciating the improvements that brings I would then research and purchase an outboard DAC to be used with your Node and CD player. Then one could consider upgrading the power supply to your Node or consider another streaming option later.
Take each step at a time, considering you need not spend your entire budget on the amplifier, thus saving some for the DAC. I would suggest you start another thread on each item.
I also think a $60 expenditure on the book 'The complete Guide to High End Audio' by Robert Harley to be beneficial.
Good luck in your quest.