Two Sonicwalls in Series

Our Sonicwall NSA 3600 is managed by a third party thus, we don't have control to make the changes necessary at the times we want to make the changes.  
A little overview of network:
Sonicwall -
X0 = LAN
X1 = WAN (Fiber circuit)
X2 = WAN (Cable circuit)
X3 = VLAN20
X4 = VLAN30
VPN

-Does it make sense to place another Sonicwall in back of the 3600 and plug in the LAN and the two VLAN's so that we can manage all the LAN traffic ourselves?
-Another scenario would be to split the WAN connections between the two.  However, that may get messy with because that would require two VPN tunnels because ultimately every device has to access resources at another location.
-Last would a layer 3 switch provide enough routing capabilities to accomplish the goal of being able to manage most of the traffic instead of being hamstrung most of the time waiting for action.

Looking for a little enlightenment!
Thanks.
WebccAsked:
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Don S.Commented:
I'm not sure what you mean by managing traffic?
WebccAuthor Commented:
Being able to control the egress and ingress of packets.  Being able to setup VLANs, rules, etc.
RafaelCommented:
Have you considering installing a transport switch to route the traffic?  You could use a L3 switch such as a 3750 to rather than an extra Sonic Wall. Then you can dictate the routes and where the traffic path your network goes.

HTH
-Rafael

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WebccAuthor Commented:
Can you elaborate on the configuration of a Layer 3 switch, just a simple overview.
WebccAuthor Commented:
Have researched the topic myself and have concluded the we will run two firewalls with HA.
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