Opinions on DAC to improve my streaming setup

Hi,

My setup currently consists of following:
Music Fidelity A308 integrated
B&W CDM 7SE speakers
Music Fidelity X-DAC 
Apple Airport Express (for streaming redbook quality Tidal)
Meridian Explorer DAC2 - for streaming MQA

I do not have any CDs my source is exclusively Tidal (and may Spotify Hifi). I am looking at about £500 second hand and looking at following devices:

Bluesound Node 2i (also for Tidal/Spotify transport)
Music Fidelity MX-DAC
SMSL SU-9 DAC
Gustard X-16
An older DAC like Music Fidelity Tri-Vista 23 (which is Tube)

I know MQA is controversial so just wanted to get people's thoughts. Ideally would like to move into Spotify Connect territory but might ok using my Macbook as transport until there are more (reasonable) options in the market and focus on SQ for now.

Thanks