Personally i'd go for the Weitec's, heard only good
reviews of them.
However, that said, which Koni's were you looking at? I'm assuming the STR.T, i'd go for the adjustable Sport version if I had that bit extra.
Have you looked at the KW kits, can be had for around the cost of the Weitec's
Have a look at venom motorsports website (.com) for more idea's!