Which run dialog

I just switched from the standard Gnome window manager to Openbox (still running inside Gnome) and like it a lot. However, now I need a new run dialog, e.g. the thing popping up when hitting Alt+F2 in Gnome. I see in the Openbox wiki, I can use the one from gnome with gnome-panel-control --run-dialog but maybe some one can recommend a better program for this?