Small PCs

I'm planning to get a Soekris net5501 to the be the house router (so: IP routing, NAT, DHCP client/server, secnet VPN, DNS). Before I do, are there any similar devices I should consider as possible alternatives?

What I need is:

• Silent or at least very quiet
• At least three ethernet ports (house LAN, house wireless, upstream)
• Must be able to run Linux without undue hassle

Nice to have but not necessarily essential:

• Serial console (but I can faff around with a keyboard and monitor if it comes to it)
• Compact flash storage (I have a spare 2GB card, which is unrealistically small for my camera)
• x86 architecture (my plan is to transplant an existing lenny install onto it)