Never really considered anything but DnD. Tried a various of other games over the years, but none stuck more than a few sessions. I guess that DnD rules, no matter what version, always appealed to me.
Atm I am running some homebrew, with a plotline inspired by Eyes of the Lich Queen, but I figure we should be done by christmas, leaving ample time for another arc of the campaign before I kill them all and start a new one with 4e.
Although, depending on level and what the players want, we might convert and continue. Only time will tell.