Ryan,
Making the jump to SPS can be a difficult one. My recommendation is to always start with a couple of inexpensive "easy" ones, like green slimers or green caps (green slimers are still one of my favorites). If they grow, you can usually keep some more difficult ones.
With this in mind, it's rare that SPS dies in just 2 days from unsuitable tank conditions. I would re-check your dipping, transportation and acclimation process, along with a complete check of your tank's parameters. Yes, there are folks who don't test regularly and do well. HOWEVER, that is usually from folks who have many years of keeping SPS under their belts, and they can recognize problems by the reactions of their corals. You need a complete test run.
It might also help if you post a complete description of your setup, and what test results you have, including the brand of the test kit.
Getting over that SPS hump can sometimes be trying. We're here to help.
Bill
215g FOWLR... and anemones, GSP, gorgonians... carp, that isn't FO!
"I killed my first SW Fish in 1971..."