I think that provided the WL-520gU and WL-500gP v2 remain available, the most obvious reason to find an alternative is to decode a wider variety of streams. I'm sure there are plenty of people in Britain who would like to be able to listen to the BBC via WMA or 3GPP (http://faq.external.bbc.co.uk/questions ... radiohowto
). There seem to be some more powerful routers well supported by OpenWRT (the Buffalo WZR-HP-G300NH springs to mind). It is available in the UK for around £65 - more than the original, but with potentially greater value as a radio. My only detracting comment would be that it uses bizarre aerials that do not look easy to integrate into a custom design.
I may, if I find time, try to acquire such a router and attempt to emulate MightyOhm's excellent work, hoping to offer a wider range of stations to people. It's going to be tricky for someone who barely gets Linux, however!
Just my thoughts.