It really depends on your budget and ability.
The standard D4 is a really good car , the WCE version was just tweaked to give more performance out of the box.
WCE shocks are much better than the 'old' items easier to build and adjust rebound and also much less prone to air ingress.
WCE slipper is also nice as it is adjustable whilst in the car.
As for buying from the states, you'll roll the import duty dice, and if you need any warranty help, you'll have to go back to where you bought it from. You won't be covered in EU for warranty stuff. Each kit is serial numbered, so we know where it came from.
Check out this link:
http://www.mirageracing.com/piw.php?partNo=HB61410
It's at a bonkers price and you could gradually upgrade the car to a WCE if you needed to.
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5 Time Oople Invernational SC Champion.
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