Like stated above, skip the Spark for now. It would not be useful as the newer stuff coming out soon™ will do the same and more.
A flex series could be cool to see the differences in range. Also a magic Mifare might be fun to clone certain things if it’s useful in your studies.
Any x series besides the xG3s would be a safe bet if you do want to self install.
If you haven’t already, take a gander down this thread to see some install vids. I had some of mine installed by a professional with needle lube, and I installed a couple myself without lube. I didn’t feel a difference, but I had some liquid encouragement, and tented the skin a bit differently than the installer did, so it might help, might not, but something to look into. Also, bevel facing down helps a lot to break through the skin completely.
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