If you can sneak snychronicity into a mantle then that would be the ultimate power to use dominant ideal with. Otherwise my top list would be dimensional hop, hustle, and adrenaline boost. Although since dimensional hop and hustle are in the same mantle so it is hardly a contest as you can use dominant mantle for both of them.
Ok, so
hustle (2), [synchronicity[/i] (1),
dimensional hop (1), and
adrenaline boost (1) so far. Why the last one, by the way? I'd say
energy ray would be a good candidate too, for raw utility (as you pointed out with the extended, split, twinned, and empowered for all of 1+augmentation), or possibly
crystal shard/storm, since
ray deflection won't flick that away (and we won't care about DR with the damage it'll be packing, really). The other big action abusers are rounds/minutes per level, so don't really need to be in the dominant ideal, I think. What other powers really, really benefit from not losing focus when metapsi-ing them?
Also, addressing the problem of the Chrono-Legionaire rebuild with an ardent : so long as we pick up
mirror move either as a power known (thanks, erudite!) or emulate it with something, we'll have all the feats we need to keep Leap Power Attacking (and then some).
Overall thoughts?