Request advice: considering adding SPS corals to my LPS tank

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I have a 120 gallon reef, mixed LPS and soft corals. Everything is going well so far, it has been set up for about 6 months, containing fish and corals for about 3 or 4 months.

The equipment is: 8 x 54 Watt T5 Tek-light, DIY sump with chaeto refugium, EuroReef CS-6-2+ skimmer, kalk auto-topoff.

I had two Montipora digitata frags that Hawk was good enough to contribute a few months back. One bleached out entirely and died about two months ago. The other frag has bleached over the bottom 2/3, this happened whil I was away on vacation, I think there may have been a power outage or other unknown event while I was gone.

I am thinking of trying some SPS but don't know if I really want to. I would invest in a calcium reactor if I knew I would be keeping SPS long-term, but I want to try some SPS first and see how they do.

My water specs are all zeros where they are supposed to be, Ca is around 380, that is with the kalk auto-topoff and occasional DIY 2-part.

Anyway the questions are:

Should I try SPS or just forget about it?
What would be a good/easy/cheap SPS to start with, asides from the Montipora digitata?