The limitation is the state table. You will have 30,000 states. That is all... (30,000 current open connections) Also, your DHCP leases can get large, so you may need to increase the file system size if you have a lot of DHCP. Additionally, I think there is a 16 interface limit, but I have not pushed that one at all...
Lastly, you will need a gig-e card supported, and that can be hit or miss...
As to the CPU and ram, that is way more than you need. A P3 500 with 512 meg of ram can support 15mbps without pushing it. (Unless you have a lot of VPN connections)
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