While it's not for everyone, I just swapped my black 19" tuning fork Volvo R Design alloy rims and replaced them with 18" Jaguar 6-spoke rims.
I like the look, slightly wider (8.5"), fills out the wheel well better, and easier to clean. Now that I know they fit without modification I can contemplate powder coating the wheels to match the gray of the car. Stock suspension setup. The Cygnus wheels are pretty affordable since they were the stock/basic wheel package on the Jaguar XF.
Before and afters:
Cygnus wheels off 2012 Jaguar XF
Bolt pattern: 5x108 perfect hub-centric fit
The conversion did require buying new 14mm wheel bolts without the Volvo integrated tapered washer, and a separate set of 60º-to-flat-seat washers. The new 14mm bolts have a smaller 17mm head with a 60º taper and the wheels have a flat seat. (original Jaguar hubs have flat-seating lug nuts with a 12mm threaded wheel studs.) And Jaguar "R" center caps which are a tiny bit loose, so I have to modify the spring-backs.
Tires Continental Extreme Contact 245-40-18
I am not a fan of the P7s but I have always loved the Extreme Contact DWS 06 Continentals for ride quality. (Granted, I rarely go over 90 in a straight line). American tire Depot in California has a buy3, get 4th free sale on the Contis that was under the cost of everyone I called (4 for $705 mounted and balanced).