Custom Login Redirect Based on Roles

I am using the role manager and category access plugins. I have two sets of public user roles: “group A”, another “group B”. Each role has access to a completely different set of posts/pages/content. The content access does not overlap on user roles. So.. group A can’t see group B and vice versa.

What I am trying to achieve is:

When a user assigned to role “group A” logs in it redirects them to a landing page for Group A, and when a user assigned to the role “group B” logs in it it redirects them to a landing page for Group B. But still if an admin signs it still takes them to the admin panel.

I could use a little help…well, a LOT of help actually ??