Hi,
Thanks for the assisstance.
Topology at the pool level is where I was leaning towards. With all 4 of them being in different pool.
The site in question is a file upload/download site and the topology would only apply to this one site. This is why I have to be careful with the topology rules, so that it doesn't affect or won't hinder any future topology setups. All other wideips would function within their own pools outside of this one particular setup.
In this case the business rules are as follows:
All Colo users that access this one particular site will get sent to the Colo pool
All Korat users (with IPs in a certain range) to the site would get sent to the Korat pool
All other users in Asia would get sent to the Singapore pool.
All other users to the site (world-wide and US) would go to the Okla. site.