The SP5000 are good but there are some better tires out there. I'm running the Bridgestone Potenza SO-3's and in my opinion they are the best for performance dry and wet traction. They suck in the snow.
Not sure about CV joints. Try here for part pricing:
Parts As for the suspension. Most are running konis and eibachs, check with corey on pricing. CobraR is running the
BAT struts and eibach springs. Right now BAT is liquidating their ST200 Struts, 4 for $149 (THATS FOR ALL FOUR TOTAL), I got in early and got the struts for $100, the total came to $120, all four, shipped to my house in MA. I'll probably get the eibach springs for $190. Some people have bought the Roush springs but they have a constant spring rate (which means they don't have a progressive compression or rebound).
