I have booked numerous AA awards online. It's easy. But now I have miles and points from all over and not sure what to do!

My route needs 35K miles. North America to Central America. I do this route numerous times a year.

I have:
30K plus some on AA (which can actually get an award most of the year on it's on) so don't really need help there... I don't think? Unless it will fit in with something below?

So, Here is where I get confused:

10K plus some on US Airways - doesn't go where I travel !!!!
15K plus some on Delta
25K plus some on Continental
35K plus some on Amex MR points

How do I make the most of what I have? I am most unsure of what to do with the US Airways miles. I am not sure how to book an award on star alliance, perhaps someone can explain that