remember that as my husband always says opinions are like a$$holes, everyone has one:)
The A3 with quattro in the S-line package with the larger engine is a blast to drive and practical too ( or at least more so than the Miata) but the fact that you won't get two cents for your tip allroad would lead me to keep the ar, you're a shrewd business guy, save it and sell it for parts once the warranty is over and buy something for fun to drive in the summer...my choice wouldn't be the Miata but maybe something much more macho Detroit like the Charger or the G8:)...the most practical as your wife already found her new beast is to take her old one and really be a member of our club here (read cult:), at least for a while until something really jumps out to grab you or the warranty on the ar is over...I can't see dumping a good ar with a warranty for anything...I'm flying without a warranty and am over 104k and hope to just keep flying...good luck with your choices.

'01 allroad with everything but the kitchen sink...I think it was an option but I get that at home:)
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