I'd guess you could buy one in Europe for around $45k USD, around $5-10k in shipping (where and how) and another $10k or so in new bumpers, lights, etc. Tack on the federalizer fees, govt fees, and state taxes if you have them, and you're in that ballpark.
If you tried hard, maybe less..
What price avoid that hassle, and have your cake and eat it now? $80k or less would probably buy the car in question, my guess.
Current: '03 allroad 3.0T, 6M
Past: '00 A6 4.2, '99.5 A6 avant, '91 200q 20v, '90 90q 20v, '86 5ktq