Connecting Mac to Epson PX 730WD

My new Epson Stylus Photo PX730WD was initially set-up to use ethernet/wireless connection. Although printing worked initially, after a Mac software update, it no longer saw the printer and I could not print. My Mac is connected over ethernet cable to a wireless router, printer is also connected over ethernet to the same router. Printing from other wireless macbooks and ipod/iPad worked okay.

After several attempts with new printer drivers, different versions, different sources, all to no avail, I found that if I unplug my Mac ethernet I can print via wireless connection, but when I connect the ethernet, the printer cannot be found. I set the service options to have wireless priority over ethernet, and I can now print wirelessly, even with the ethernet cable connected. But this downgrades my web browsing speed (Wireless versus ethernet).

My set-up now is ethernet connected, wireless turned off, so I have the speed of ethernet, and when I need to print, I turn on wireless. There must be a better solution, can someone provide further tips or help? Thanks so much for your reply.