isn't it 100% supported ?
RT3200, it's $46 used in US, and £60 in UK (at ebuyer).
But if you're looking into gbit speed(s), read So you have 500Mbps-1Gbps fiber and need a router READ THIS FIRST
TLDR; x86 is the way to go, repurpose the 7800 as AP..
Which leads to Tips for getting cheap used x86-based firewall with full Gbit NAT (a PC Engines APU) if you are in the US.
There are some additional suggestions after the sw301da/sw302da talk.