UQ Potential Upgrade Options

At the moment I have a UnityQute feeding a pair of Spendor Sp1s. This unlikely combination sounds great, but, it’s a few years old and I fancy upgrading the front end of the system. Having been really pleased with the UQ I have taken a look at the wider range of NAIM equipment and see a potential dilemma which hopefully you knowledgeable people can help me with.

I was thinking of a budget of about £4,000 to replace the UQ and for the moment I am ignoring secondhand though I do realise there are opportunities in that area. I don't need or want a CD player or FM/DAB radio because I stream everything off a Synology NAS and Internet Radio. I might subscrive to TIDAL if an evaluation proves to be good. I have an Apple iPad and it would be handy to have AirPLay but this is not mandatory.

Potential solutions I have considered based only on internet research at the moment are:

1) NAC 172 XS with NAP 155XS = £3,419 (70w)

2) NAC172 XS with NAP 200 = £4,180 (80w)

These combinations can (hopefully) be demonstrated by a dealer quite straightforwardly  to see whether the difference in cost is justified. However from what I have read on here there seems to be a strong feeling that the NAP200 is significantly better than the NAP 155XS but I find it hard to undertand why that might be the case (other than the difference in the power outputs).

Then there is the 'wildcard' option of a Unity Nova when they become available. As I understand it this would provide everything from option 2 plus AirPlay, a HDMI port to connect a TV and straightforward ‘over the air’ software updates for a similar price i.e. £4,099. Whilst £4,099 is no bargain (for a one-box solution) it begins to look like quite an attractive proposition.

Have I missed any options that you guys would also consider in similar circumstances? Any other comments would be most welcome.

 Many thanks in advance.