If you haven't already, READ Matt's website
http://svo73mm.cjb.net
As far as kits, the cheapest "kit" is the SVO front rotors and 5 lug drum rears for around $300-400, BUT you can not run many wheels with that front setup. Not sure if the Saleens would work, but probably not. For the SN95 setup, you can get a used "kit" from $300 for the fronts and $450-500 for the disc rear from places like
www.stangparts.com. Of course you can shop around and get the parts separately for as little as $100 for the front and maybe $150-200 for the rear if you are lucky and patient in your search. I spent about $600 on mine, with mostly new parts, calipers, rotors, pads, MC & PV. There are many other little parts you need, so read the parts list on Matt's website to find it all out.
Good luck!