
Magpied |

So many options, I was wondering if anyone had any insight? I'm playing a finesse rogue.
The only one that stood out for me so far was
Impossible Speed (Ex)
Your base land speed increases by 30 feet. In addition, if you expend one use of mythic power, for 1 hour your base land speed increases by 10 feet per mythic tier.

Corlindale |
Enduring Armor from Archmage might be useful if you have a mythically high Dex, since it gives you a permanent, scaling armor bonus with no dex cap and no armor check penalty. Armor Master from Champion does the same thing, basically - and is probably more efficient early on.
Divine Guardian from Hierophant lets you summon increasingly powerful creatures - could be useful for creating more flanking buddies early and for generally tearing everything apart later. A little expensive to use, mythic power-wise (since you'll almost always want to burn two uses each time).

Clectabled |
What Tier?
I love Precision in the Champions path, Fast heal and DR stuff from Guardian. I also like Shrug it off, turn a crit to a normal hit.
The Mythic Feat Mythic Paragon is easy to miss, but offers a lot basically a +2 Tier for all Tier based powers.
Retributive Reach and additional 5ft Reach is always helpful.
Deadly Dodge and Vanishing Move from the Trickster abilities are excellent choices without using the Path Dabbling)