Best Universal Threat Management device

In an effort to reduce our annual maintenance and support costs (as well as managing three different devices) I have been asked to research if we could consolidate our security devices into one UTM device.  Our current security devices include a Juniper Netscreen SSG140, a SonicWall CSM 3200, and a McAfee SCM 3100.  Currently we have about 250 nodes and would not expect to grow more then to 300 in the next three to four years.  Any suggestion would be appreciated, including keeping our current setup.
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Check out Fortinet's line of products, specifically the FG224B. They are a full-featured UTM system, with Application control, load balancing, Data Leak Prevention, Traffic Shaping (in/out), AntiSpam, AntiVirus, IDS/IPS, SSL VPN, the works. Their latest FW (4.02) raises the bar even farther and they have a great analysis service that you can either purchase as a hardware device or pay for a hosted one.
Kamran ArshadIT AssociateCommented:

Its a tough question to select the best from UTMs. SonicWALL, Juniper ISG/SSG, Cisco ASA, Fortinet, and Checkpoint are the leaders. Juniper rocks in its easy web management. Cisco ASA has combo SSL and IPSec VPN in one option. Checkpoint is the best firewall UTM but hard to manage. You may check out with Fortinet as well as SonicWall also.

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