PC Rainbow for upward growth form
PC Superman for tabling
Red Planet or Tierra del Fuego is a nice red most of the time. Red Dragon is a popular smooth skin. Any number of red/pink/orange millies would also work.
Agree with Red Planet and Red Dragon. Red, Forest Fire, and Bubble Gum Digis are all very bright red/orange. Red monti cap is bright also. If you're looking for more high end/expensive acros. The Maleficent, Hellfire, Diablo, Kandari, and I'm sure there's more are all very nice red acros. Not sure what LPS are red, but theres some bright orange/red shrooms and zoas that are nice also.
Red Planet and Red Dragon, as mentioned, are great. Atlantis Christmas Mirabilis is a great acropora with red/green contrast that really pops. The Wet Thumbs version of Tierra del Fuego is really red, but you need lots of light.