Keep on writing then...
Millzy, how about a used X-6 all hopped up? Lots of them for sale on here...
I can tell you this: The B4 is great to drive, but the X-6 is very different. Much more like a 4WD + tons of steering = super fun!!! And when you try the B4 again after getting used to the X-6... you simply shelf it or sell it
All in all I think the best economical way of doing it is to sell a complete B4 and buy a complete used X-6.
Just my 5 cents