The wireless implementation on the PS3 is not great in my experience, I'd go with Ethernet if possible. Have you considered "powerline ethernet adapters"? if you want a wireless router, really anything will do. for value i recommend "tp link", if you have a bit more i like linksys/cisco.
I will warn you that I found I had a wireless a/b/g/n router running in g/n mixed mode, and i found I had to turn some of the options off to keep the PS3 running reliably. for example setting the channel width to 20mhz only instead of auto.