Just stay away from expensive acros for a year or so IMO. You can spend the rest of your life killing those once you're an expert
Edit
I'll also add: decide what you want long term. If you want encrusted rocks - then by all means go for leptoseris, encrusting montis, leptastrea, chalices, etc. If not - make sure they live on their own islands.
Edit
I'll also add: decide what you want long term. If you want encrusted rocks - then by all means go for leptoseris, encrusting montis, leptastrea, chalices, etc. If not - make sure they live on their own islands.