before you do try the Texecom tech support line. Tell em you just bought a premier and it makes no sense. See what your answers are. From that buy texecom
We are all mind readers here in the mod team...
Yes the app will be updated and the firmware for the panel will be updated with it.
http://www.texe.com/uk/technology/connect/
Buttons work well and keep cost down. I have fitted a few KP160's they are just a gimmick IMO; much like apps, but that's a different story.
You need to decide if your DIY'ing or getting an installer in before the forum can help further.
Which kit is all irrelevant at this stage.
Overall you need to make a decision, your probably better off going for the simplest diy fit and probably is pyronix as that's what it's geared towards and although you sound if you want to spend , you don't want to pay to have it installed because installer rates to high for you......
Re: Texecom app, it is a bit lumpy but it works. The plan is to overhaul the application in the near future so you could firmware update your panel and use the new app when it's released.