Should I go with the Koni kit from SPMotorsports ($819.95) or the BAT Euro kit ($595.00 kit), Or just buy seperate parts?

Right now I have $650 to spend on my lovely SVT, but by next week I'll have $900... any opinions?

I want to finish my suspension and driveline this year... that means springs, struts and all the necessary components, sway bar, strut braces and all that. As for the tranny, I will need LSD for the 3L and Turbo that I have in mind for next year. Also Flywheel/Clutch and maybe a new transmission as this one is near its end (99k miles on the car btw).

I chose to do suspension first because the car feels very unstable in cornering, especially at higher speeds, if I'm going over 70MPH and entering a curve, etc.. (I ran over a tire on the highway during the night, doing about 74MPH... which somewhat damaged the car, the tire was from a truck. Funny part is... 2 other guys hit it as well before me, and one of them was a Contour LX, we were both standing in the shoulder lane with our heads under the car lol)

I'm not really good with upgrading a car, everything I learned about the Contour is from here... I don't post much as I use the search feature for almost everything (I used it for this too but I still want opinions)

Sorry for making this long,
thanks in advance