>Cisco PIX Firewall Version 6.3(3)
The very latest (and LAST) is ver 6.3(5) which is a maintenance/bug fix release that adds no new features.
>This PIX has a Restricted (R) license.
ALL 506e's have Restricted only license. There is no upgrade. Only with model 515 and above you could upgrade to UNRestricted (UR) license
>IKE peers: Unlimited
This is misleading because of the stated limitations in the documentation.
Personal opinion - your "consultants" don't know the Cisco product very well.