I've found that there are FAR superior logfile analyzer tools on linux than windows. We ended up sending all our log files from the windows servers we have to a consolidated drop on a linux box and running a linux based analyzer. It gives better information, more detail, etc. Things like splunk, awstats, mod_log_sql (which lets you do live "top links" type things), and any of several other tools available.
I'm definitely not stuck on the tool we have. I'll check out the couple you mention. If you have a recommendation that would be great. We pretty much look for general stats, what pages are being hit and how often, etc.
Thanks, James