This my connection

http://i39.tinypic.com/2m2yo2r.jpg

I want to ask what is the maximum speed i can get? i also would like to know which of the following modem router better to use especially for gaming since i have them all :

1- Belkin N1 vision Modem Router
2- Billion 7800N Modem Router
3- Netgear DGN3500
4- Buffalo WBMR-HP-G300H with dd-wrt firmware

Please i need your help as soon as possible.