If you play that music in mono you'll hear some pretty phasing. For me, that's where the authenticity lies rather than whether you use a real 64 or BBC.
I notice many C64 'remixers' never even touch the SID. Or if they do they also add other synths and mix to stereo anyway. I wonder why they suddenly call for only the genuine article when they've defeated their own object.
I'd love to hear some of your chip music Razmo.
This next jingle was dashed off using a nice combination of 'bloopy' 8-bit chipsound with a smoother synth.
Emulation will completely take over one day anyway. As kit gets scarce whilst retro appreciates, ever more versatile sample packs and VSTi will fill the vacuum. I suggest everybody build up their own 'retro walls' now because you'll have no economy choice in 20 years' time!