since you bring up autocrossing, I'd read
=http://farnorthracing.com/autocross_secrets.html]this before buying any suspension.
Where there's no Bilstein fitment and Penskes are too expensive, Konis are usually perfectly adaquate. They are, by far, the best budget shock and better than any of the crap coming out of Japan. JIC, GAB, Tokiko, Tein - synonyms for "crap".
FWIW, I went from stock to TEIN SS to K-sports back to the TEINs and added Delsing camber plates. I sold the K-sports because the ride was too bouncy for me. The spring rates on the K-sports (9kg/mm) are stiffer than the TEINs (7kg/mm) in the front. One of the K-sport struts that I sold to my friend busted on him, and is now leaking oil. I've seen this problem a few times with members on the board.
The "32-way" adjustability isn't really 32-way. It's more 2.5 turns from hard to soft; there's no way to know how many "clicks" you've gone. The TEINs have a definate "click" to know where you are on the scale.
I did like the camber plates on the K-sports, but the dashed lines meant nothing. There was no "0," and the dashes are probably the same for each suspension that they send out for all make/models. That means they mean nothing for measuring what camber you have.
Pirana mentioned the endlink tabs. The set I had came with the adjustable endlink collar for the front struts. One of mine worked itself loose, and bent the AWR adjustable endlink. That was probably due to user error, but still something to consider.
To sum it up:
1. I think you may be taking a risk buying the K-sports/D2s.
2. TEIN SS + camber plates will probably be out of your budget.
3. Bilstein or Konis from AWR are probably way out of your budget (I haven't check his prices lately, but it's all custom work).
So what option is left? Find a good set of struts, and put on your own set of collars (Ground Control, Skunk2), then get the spring rate and spring height you want. Also see if you can get your strut valved to your spring rates.
Come over to
Racing / Motorsports section and check out
STX Build Thread and
Street Prepared build to see what racers have been putting on their cars.