I Have a 20g Reef as well, and there are many lighting options for a 24" tank.
Now is the time to decide what kind of livestock you want to be keeping in the future as this will affect your lighting choice.
You should have a look at some T5HO fixtures as well as some, MH/T5HO all in one units.
With those you will be able to keep pretty much anything you want.
With Metal Halide you will have to keep a close eye on your water temperature.
With the other items you listed, id ditch the Aquaclear (not needed, some people use a larger Aquaclear as a fuge) and the Rio Nano
and go with an AquaC Remora or Remora Nano, Much better skimmer!
And as far as livestock goes, take it slow with the fish to see how your tank responds to the increasing bioload.
Like i said before your lighting will affect your coral choices so you'll have to make that decision first.
Good luck!
It will be very rewarding and i think its great that you taking a couple months to prepare!!
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