I have to agree with kodiakz... the headers are a lot of money, trouble, and possible problems unless you have already done EVERYTHING else.
(Everything includes a blower in my book...)
As to whick programmer... I must defer to Hummersgonewild... He's done a couple of posts about them that are very detailed. Search on his name and you'll find them.
The gist of it goes something like this:
hand held programmer +25-50 HP
Notebook PC with software & Dyno +50-100HP
I would get the programmer and start hoarding cash for the supercharger...
(I might also suggest upgrading your couch before the install of the SC)
