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VLAN between ISA server and Cisco Router

The room containing our internet router and ISA server is to have the server removed to another location, leaving only the router in place. Can someone advise me on what I propose to do below is advisable or whether it is a really bad idea.

Out current setup is a network with 8 VLANs. Internal routing is performed by a 3550. The connection to the internet is thus:

Cisco 3550 -->(trunk)--> Cisco 2960 --> ISA 2004 --> Cisco 1841

Because the ISA must be moved to the same physical location as the 3550 (which is no where near the internet router), what I want to do is:

ISA 2004(default gateway) <--> Cisco 3550 --> (trunk) --> Cisco 2960 -->(internet VLAN) --> Cisco 1841

I'm a bit concerned about the security issues regarding the 'internet VLAN' I would have to create for the connection between the ISA's outbound interface and the 3550, and the connection between the 2960 and 1841 router.

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