I went with the pen name option but that's because I write across genres.
I didn't want someone who liked one of my books to pick up another with the same author name, only to find the book was NOTHING like the previous one. I never want to disappoint readers if I can help it, so this was just something I did to try to mitigate the risk. Still, I pull all the names together on my website, under my real name. I figure if someone's gone to the trouble to visit my page, he or she also will take the time to read the book descriptions to decide what sounds interesting based on the description and excerpts.
If you're not going to be publishing wildly different types of books, then you could go with one name.
And yours will always feel most right for you.