I dry hop in a secondary if I plan on harvesting the yeast from the primary. This avoids having hop debris to worry about. Other than that, no secondary for meHere's part of what John Palmer said in the Ask the Experts section of the AHa website...(full text at http://www.homebrewersassociation.org/pages/lets-brew/ask-the-experts/john-palmer?cid=wr6B8CL9lj0q%2bJT6ImywRQ%3d%3d&redirect=http://www.homebrewersassociation.org/pages/lets-brew/ask-the-experts/john-palmer if you're a member)
"Therefore I, and Jamil and White Labs and Wyeast Labs, do not recommend racking to a secondary fermenter for ANY ale, except when conducting an actual second fermentation, such as adding fruit or souring. Racking to prevent autolysis is not necessary, and therefore the risk of oxidation is completely avoidable. Even lagers do not require racking to a second fermenter before lagering"
I almost never use a secondary. I decide on a batch by batch basis if I need it and I alost never do. I have found no negative impact on beer quality by not using a secondary and it's a heck of a lot easier! Since you have a conical and can dump yeast and trub, I can't see why you'd even consider it.
What about dry hopping? Can you do that in primary or is that a qualifier for secondary?
I don't rack to secondary just to dry hop. If I decide to use a secondary, I dry hop there. Otherwise, I dry hop in primary after the fermentation ends, or dry hop in the keg.