Anticipating next upgrade after B&W 803 D3?

Looks like OP got HT setup. Start with source before you think about changing speakers, Bluesound Node 2i is the weakest link in your system. Adding a decent DAC to Node 2i will improve sound but.....If you’re serious about retrieving best possible sound out of 803D3 and 2 ch audio, get a better 2 ch amp with a tube or solid state preamp that has HT Bypass. Get rid of 5 ch MAC and use Marantz 5014 AVR for HT. Until you do this, don’t bother upgrading your speakers. You will be wasting your money!!!!!

I have been through this transition. My HT setup had B&W 800D2, 804D2, HTM2D2, SCMS with Krell Evolution 707 processor and Krell Evo 302 / ATI N Series amps.

I am biamping ( wronging stated by me as being biwired above) the b&w speakers with the 5 channel Mac.  This should go far to solve any powering needs for the 803’s.

The ATI N series amp in 2, 3, 4, 5 channel configuration will blow your MAC 5, even in bi-amp mode. Don’t get hung up on watts, ATI class D 200W power amps with massive power supply will drive your power hungry B&W like no other amp. 

https://www.ati-amp.com/AT54XNC.php

My system has the b&w’s, McIntosh 5 channel amp biwired and a bluesound node 2i and a marantz 5014 avr used as a preamp. i am now seriously exploring the Chord Qutest dac and maybe the m scaler

Speakers? Dude! Your first priority should be a very nice stereo integrated amp (Hegel, Ayre, etc.) or stereo separates to do your speakers some justice and a good DAC ASAP followed by a better streamer. That mid-fi AVR, among other things, is absolutely killing your sound. Preamps matter!!!

Soix is correct. ^^^^