ldap/krb5 auth and access point Authentication methods ?

Hello, We are using openldap/kerberos (MIT) and just bought 2 CISCO Aironet 1250. I'd like to use freeradius to auth. our users. I read that freeradius can use openldap and kerberos, so i suppose I will setup these for auth. Most of my Wi-Fi users will be Windows/Mac Os and I'd like to avoid custom installation on the laptops. The question is : Which auth method should I use on the access points ? tx !