True orange SPS are uncommon. Orange digitata might fit the bill, but others hate them. Orange acropora are very rare and usually not all that easy. AV99 Orange Crush is a green corla with real orange tips that looks really nice when larger. Battlecorals Honeycomb gets true orange for me - seems like this is the same coral as RMG Gila Monster, but I could be wrong.
There are many blue SPS. Try to find some ORA Cali Tort. They are usually cheap and available from hobbyists in many places.
I have a forest fire digitata that is more orange and grows very well. German blue digitata is slower but is a nice baby blue. There are bali blue slimers out there as well. The best blues I've seen are all acros. Top on my list is the Oregon Tort.