I have a network of web sites for affiliate marketing and am looking
for a good campaign management package.  The package must allow me to
analyze the behavior of visitors the the sites by a variety of
categories (That I set up), including campaign type, specific
campaign, source (PPC vs search engine vs ?), type of media, series of
media (such as banners), etc. etc.  In addition, it needs to allow me
to enter costs per click or visitor into a campaign and give me an ROI
analysis.

The package must either be a service (javascript or similar links from
the web site pages), or a web log analyzer that I run locally.

My questions are :

1. Please recommend affordable (not enterprise, high-end) packages or
services that meet these needs (especially  the ROI calculation need).

2. Where can I find reviews/lists of packages.services that meet these
needs ?

1.