The 502-T isnt that great of a router to be blunt. Trying to troubleshoot the wireless and other problems on 2 friends ones wasnt all that fun either. High end dlinks work well, but the cheaper ones (aka the ISP lineup) arent that great tbh.
I have the Dynalink RTA1025W and it works great. Many others recommend it, and gameplanet forums broadband section would suggest it too. Do yourself a favour and try and find one.