Congrats on a nice car, you'll love it. Does sound like the DRC has had it. For mine, just replacing it did wonders. While most suspension options can be made to work, I question the worth of the adjustable suspension as you sure won't be under it every day tweeking it for each trip. Standrad springs with bilstein or koni dampers make a huge difference, I've done that on both my cars and they handle better than needed on the cross section of roads encountered around this country.
Re purchases, PM me if you are interested and I'll fill you in on my experiences with the various companies and freight options. Freight, taxes and duties can be a lot more than you might envisage so that converted price might sound good on it's own but I've found lately that local purchases can be quite attractive IF all the dots line up.
Finally, stock levels in the US may not actually be what is inferred. I have just spend $1K and had to make several changes to the order as deliveries went right then right again.
C5 RS6: Sportec, Milltek & Wagner -- B5 RS4 : tastefully modified -- Audi 1.8 quattro 132 Kw -- UNIMOG 404 TLF8