Has anyone gone with 20" front wheels and 21" rears? I'm considering this as I think it's a perfect look for the jag. Many other cars run this such as the zo6 and viper..was just wondering if anybody here has done it yet

 

The problem with doing that on an F-Type is that the overall diameter of the Jag's tires are nearly the same, so you would end up with very low-profile rears (305/25's) and much taller fronts (265/35's).
It could end up looking heavy in the front and too thin in the rear.
I believe these other cars actually run smaller diameter fronts and similar profile tires.

 

The OP is running an RWD, so different tire ODs front to rear would not create any issue. I'd use a 305/30-21 tire to maintain the same sidewall and adjust the rear ride height down with some VAP springs to compensate for the 1" larger tire diameter that will increase the rear ride height by 0.5". This will avoid the California rake look.

 

Ah okay. I believe I've decided to go with the vs 013 style wheel in a 20" set up all around with Ps4s rubber..cheers all!