This link sums up the different between Standard and Enhanced SonicOS.
http://www.firewalls.com/community/firewalls/articles/105-product-comparison-sonicos-standard-vs-sonicos-enhanced.html
Feature Comparison (SonicOS 5.0):
SonicOS Standard
SonicOS Enhanced
Management
Web GUI, GMS, Syslog, SNMPv2c,Wizards
Web GUI, GMS, Syslog, SNMPv2c,Wizards, SSHv2
Configuration
Wizard driven optimized for ease of use.
Object and Zone Based powerful and granular control.
UTM
Protocol Based // Services Dashboard
Protocol and Zond Based RBL Spam Blocking Application Firewall // Services Dashboard.
Networking
Fixed LAN / [...]



