You have at least 2 points you can have a issue. If you have issues when use both wireless and wired devices then you have more than likely exceeded the bandwidth you can get from your ISP. If it only causes the issue on wireless you could just have simple contention or it could be interference.
If you issue is you are out of internet bandwidth new router will not help you need to buy a larger connection.
The a new router might fix wireless issues. They make "gaming" routers that give the ability to run quality of service for certain users. You in effect give your PS3 good response and everyone else poorer. This does not fix all the issues since it may be interference between the devices.
Your router can run third party software called DD-WRT. Not exactly simple to use but this may be a option to try before you buy another router. WRT has a QoS option that may meet your needs. Be careful you can make your router unbootable if you do not follow instructions.
I was wondering if someone could point me in the right direction for what I need to accomplish. I have my ps3 connected to the internet wireless using the Netgear Wireless-N WNR2000 router. Whenever I am online with my ps3 and I access the internet using any other device (i.e. iPod, laptop, smartphone, desktop) at the same time, the connection starts lagging on the ps3. Can someone please explain what might be happening that causes this lagging to occur? In order to help relieve this issue, what would you all recommend I need to do? Would this be as simple as upgrading my router? If so, which one would you recommend? Thank you all in advance for all your help.