So your wireless router is starting to flake out on the wireless part, but the computers connected by cables are still able to get their connection perfectly, and you've got a bajillion forwarded ports set up that you're really not looking forward to typing in on the new router you have to get?
Here's a handy tip from me - find the setting in your new router that says "DHCP SERVER - ENABLE/DISABLE." Flip it to "Disabled," change it's LAN address to be in the same 192.168.THIS NUMBER.whatever IP range and plug one of the LAN ports (not the WAN port) into one of the LAN ports on the old router. Voila, your new wireless router is just an access point for your existing network and you can put off doing the actual work of setting up your new router until the old one absolutely dies completely, taking its settings with it, making it 10 times as inconvenient to remember and enter in all that information to the new router!
Hrm, I'm starting to think maybe this isn't such a great idea.