Cheapest and easiest would be the stock SVT without the res.

If you've go cash to burn, get the ZXTuner Couger header for $385...

http://www.zx2racing.com/store/closeup.asp?cid=33&pid=117&offset=0

and modify a nice SVT aftermarket exhaust...

CTA Motorsports Magnaflow $440 to $635 (depending on single or dual and with or without res)
http://www.ctamotorsports.com/contour_parts/contourexhaust.htm

SP Motorsports Bassani for $600
http://www.spmotorsports.com/ATCcontour_exhaust_catback_bas.html

SP Motorsports Borla for $700
http://www.spmotorsports.com/ATCcontour_exhaust_catback_bor.html

SP Motorsports Bosal for $550
http://www.spmotorsports.com/ATCcontour_exhaust_catback_bos.html

You only need short pipe between the header and the SVT exhaust to make it work. You will also have to disable your EGR if you get the Cougar header. If you're worried about emissions, stick a performance CAT in there. If it's too loud, you can always add a res later.

HTH,
BP

Ben ---'96 Contour GL * Zetec ATX * Tan on Black steelies--- +++JRSC M62 Under Construction+++ My big-a$$ mod list.