Yes, i did mean use the IP address you set up in the router for the PS3. If you used the 192.168.0.110, then use that in the IP Address blank on the PS3. At this point all i can suggest (other than the new router) is go back through the router settings and make sure you have everything properly in place. Maybe the MAC Address you used in the DHCP Client List was wrong?
To be honest, i would say get a router that uses 802.11 G instead of N. The N routers do not seem to play as nice with the things that are not using that level of transfer. As i mentioned above, the 802.11 N router specs have not been finalized by those that regulate this sort of thing- manufacturers are going by what they think it will be. Unfortunately, this leads to some things not working as well as they should (in this case the backward compatibility to 802.11G for those machines that use it, like the PS3). Even if it did work you would have seen no difference in your speed as the router would go back to 802.11 G for the PS3- you spent extra cash for nothing.
Going wired would not make any difference if the settings will not work on the router. If you can't take that one back you should be able to sell it off privately on eBay and get most (if not all) of the money you put into a new router back.