SQL Memory Question

I currently have a SQL 2005 server that initially had 48gb of Ram, and 36 of it was set as max for SQL. Over the weekend I installed 128gb and was going to adjust the Ram on SQL. So the question is, should I set the Max to 120, leaving 8 for server and websites hosted on server?

Also what should I set the min to? 0? or raise that?

Thanks

Cip