Cedia Hi Pete,
Congrats on the CEDIA ownership.
However, you need not worry about the AC compressor sound as it is common on almost all CEDIAs (incl mine) and as RajaTaurus mentioned you can try altering the thermostat settings to get longer durations between auto cut OFF and ON.
With my stock BRIDGESTONE POTENZA's I have never noticed the tyre THUD as you've mentioned. Driving in the city is silky smooth on stock footwear. Normally, I maintain 29PSI Tyre pressure.
I had changed to LENSO mags and MICHELIN XM ENERGY tyres which gave me better handling, but were giving me an annoying HUM due to which I reverted back to the STOCK set up. Luckily, I had retained my stock set of rims and tyres.
I am happy with STOCK SPECS as I have very little highway driving and the POTENZAS are doing very well for me in city driving conditions.
Alternately, if you have a higher highway usage you could consult the pros here for advice on correct specs for better footwear, though. 
Last edited by President : 10th July 2008 at 21:19.
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