Easy to keep sps

[Aquattro]

There are no acropora that are "easy". They all require good water quality, great lighting, flow and room to grow. You also need experience in knowing when they aren't happy and a good idea why.
If you must have some SPS, start with m. digitata. These will be the easiest to care for, grow well, and are cheap to replace until you gain experience with SPS. Typically new aquarists should have their reef running AND stable for a year before trying acros. This is not a rule of course, but a very sound guideline.