Okay, that's three people who've called themselves "geeks" for knowing anything about D&D. Where I come from geeks are people who know anything about computers (and they'd sooner drop dead than admit to even hearing the name "Dungeons & Dragons").
Computer Geeks and Gamers are two subgroups of Geek/Nerd that often overlap. Just to add a little confusion, people who play computer games are also called Gamers.

Getting back to the orginal question, how about Mystra, what could be better than doming the mistress of magic? Any of the drow goddesses would also work nicely.

Yes I am a geek and proud of it!