dlink router i think able to change firmware

[adbp1]

hi all, ive forgotten the name of it so hoping someone can help me !!
was told on here a long time ago about a £30/40 router i think was from dlink that was able to change the firmware to make it a £300 router!
basicly i need a router to restirct access or bandwidth to a computer in the house allowing more speed to be given to mine!

 

[adbp1]

currently have the sky router (netgear)
after doing a quick search on google at the ones you mentioned im pretty sure it was the Linksys DDWRT.
i basiclly want to be able to restrict to my sisters pc and give more to me so i can play online games more!!