I have exactly the same set up.
Winter tyres on 18" Avus wheels and 'summer' tyres on 20" FE wheels.
The 20" wheels are, indeed, a harsher ride but how harsh (and noisy) is very dependent on the tyres. I bought the car with cheap tyres on it and thought a wheel bearing had gone! New Vredestein tyres made it a lot better for ride quality and noise, but they got noisier when worn.
I've now got a set of Toyos (on Marcin's recommendation) to fit when the 20s go back on, but 2 of the wheels need to be refurbished first. I spoke to the guy who refurbished them last time and he assured me of a match!
But, whatever the ride quality and noise, doesn't the car look great on in the 20s? 
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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