It seems you might have settled on 6w5, but in case you're still considering the poll options.....
Each of these (3, 5 & 8) are from a different triad, which makes for significant differences in their core motivations. Focus on your core motivations for your behaviors & attitudes & life, and then identify which triad & which type from it sums them up the best.
3 is in the heart triad. All of the heart types are motivated out of a fear of having no value. 2 seek to establish value by becoming necessary to others, 3s by impressing others & achieving status, and 4s by establishing a unique identity. In this way, they all try to fill that core emotional need to have value.
5 is in the head triad. All of the head types are motivated out of a fear of being controlled by others. They seek a mental freedom. 5s seek to understand the world from a distance & gaining knowledge becomes a way of conquering it, 6s either rebel or adhere (counter-phobic or phobic) to perceived authority in order to control its influence & not be controlled by it, and 7s seek novel experience & avoid unpleasantness to resist being boxed in or affected negatively.
8 is in the gut triad. All of the gut types are motivated out of a fear of their basic needs not being met or not being secure. 1s seek security by creating & maintaining structure & standards to meet their ideals, 9s withdraw into a fantasy world & seek to keep peace to promote external stability to protect their inner security, and 8s seek power so they can make sure they have what they need to be secure or to create security in general.
Also: 9, 4, & 5s are often said to be withdrawn (or passive) types; 2, 1 & 6s to be reactive (or passive-aggressive) types. 7, 8 & 3s to be proactive (or aggressive) types. These attitudes/behaviors are most obvious when their core need is threatened. If you're a withdrawn type, then you'll withdraw into your head to deal with it & usually let it blow over. Reactive types respond to the threat at hand, but usually don't go beyond that once it seems safe; they may resist taking responsibility for actions because of this, insisting it was provoked (hence, the passive-aggressive tendency). Proactive types take preventative measures, meaning they can get aggressive and will go beyond what is needed to quell the threat at times.
This article is really useful, IMO. It's from another forum, so you may not have come across it yet. It kind of "groups" the types into yet another set of subcategories, based on the id, the ego & the superego. It further clarifies the core motivations of each type.
http://personalitycafe.com/articles/47315-freudian-theory-enneagram.html