Improve sound

DAC first. The Bluesound Node 130 is not a  limiting factor as a streamer, but the internal DAC is. A Denafrips Ares 12th anniversary and the Musician Pegasus are both about $1,000 and are much better than their price might indicate

I have a pair of martin logan 40i. Blusound node most recent version. Anthem mrx 720. I have the speakers connected with bi wire blue jeans speaker cable. The blu sound via optical cable.  I have about 1000 dollars.  What could I upgrade.  Thought about getting an amp like the parasound 23+ or upgrading the streamer to a cambridge. Please I would love some help/suggestions

There are about 100 ways to go.

• simplicity: TDAI 1120 (but that breaks the $1000 budget)
• active speakers and get rid of the cables and amps (also breaks the $1k budget)

Personally I would save the $1k and give it some thought as to the outcome.
Saying one wants “better”, sort of demands some idea of what better is, so we can go about getting towards what better is.

What is it that you do not about it like currently?
How is the current system less than ideal?
Which of your system components do you feel are keepers?

I'm (sort of) with @holmz . For $1k, I think you can make some sonic changes by replacing something, but it may be the sort of thing you like at first but then later realize it doesn't really allow you to enjoy the system more.

You did not mention your room.  I would think real hard about the room, speaker placement, setup, etc. and fiddle with that.  You may find the need to spend some or most of that budget on some treatments or other things relating to the setup, and if there is improvement to be made in terms of setup, it will vastly outstrip what you can achieve by dropping $1k on equipment given what you already have.

I’ll be blunt. Your $1000 budget will allow you to achieve a marginal improvement at best no matter where you direct the funds. It’s a waste of time and money. My recommendation would be to continue setting aside the the funds for a better upgrade, one that will be a significant leap forward. Like a used pair of speakers that retailed for $5k-$6k. 

Another vote for getting a better DAC. I have the N130 and went with a Denafrips.  Also, if you can use the USB instead of the Optical from the Node, you’ll hear a big difference.

All the best.