Serious quadras are Gamma (ESI, ILI, LIE, SEE) and Delta (EII, SLI, LSE, IEE). The discernment is based on the valuing of Fe/Ti (Merry) vs. Fi/Te (Serious).
This may be helpful: http://www.the16types.info/vbulletin...15-Four-Quadra
I used to test as an enneagram 6 for a long time personally, but decided 9 gets to the core much better. It will probably take some time to nail down a type.
If you are interested, many of us chat in this room: http://tinychat.com/chickenshack. You are welcome any time! Usually there are more people there in the evenings into the early morning (if you live in the Western Hemisphere). It tends to be dead during the daytime. Interacting more directly with forum members would help determine your type. But if you're not comfortable with or don't desire that kind of communication, that's totally cool too.