Ok then,
This router will be good for you at any rate. I have many devices connected to mine and it work great for general use and gaming.
Yes, turn off gamefuel as you probably wont need this.
If your going to be streaming video to your wireless device, I might use the WISH options for this. I don't do steaming for video over wireless so I don't have any experience in setting it up. If you do a search on WISH here on this forum, I think I saw some people talking about setup for it.
There than this, I don't have any other recommendations for this router and your use.
If your seeing a slight decrease on speed on your bridged modem. Then I would presume that had to deal with that modem and your ISP. If your not doing any gaming or using any game consoles on your system. You could return the ISP modem back to unbridged mode and then connect the 4500 router up. It should work well in that mode too. I would put the 4500 routers IP address in the ISP modems DMZ to be sure.
The only reason for bridging the ISP modem if using an external router is that when gaming, there are Network Address Translations that are effected by having 2 routers in line. This effects how the 4500 tries to pass networking data to game consoles that need to connect to various game servers. If your not going to be doing this, then maybe you can run the ISP modem in non bridge mode and connect up the 4500 router. I might try both modes to see what works best. Let us know how it goes.