Sikes

I mainly play MMOs like World of Warcraft and Everquest 2. Generally my dialup connection works well enough with MMOs, but I usually get severe lag spikes or all out lag like in City of Heroes (Average ping 400+ with spikes of 4000 in CoH). I've timed out many a time because of my connection. I did play alot of FPS, back in the old days, i.e. Quake TF, and Counter-strike. However, I've totally quit playing any type of FPS online because I get an average ping of 400 to 9999.

I've been searching over the forum and haven't found much information on ISDN. I would like to know which service would be a good option for me.