I would suggest buying a wireless repeater. It will expand the range of your router there fore making your signal stronger and also if you download often set a cap for your download like at 100kps. in the end the ps3 only has a wireless G so no matter how good your router is your ps3 can only be so fast.
I'm always getting DC'D from PSN no matter what it is I'm doing. Playing GT5, watching netflix or hulu. I try to open the ports but when I use a port checker says ports not open. I'm using the **bleep** equipment provided by TWC. The router is a Motorola sbg6580. Anyone know how to get the ports opened, or getting in the DMZ on this?