As Barry has said, try to pick stars that are as wide apart as possible and if you can, select ones that when joined with an imaginary line, the line passes as close to your zenith point as possible.
Just as a note, I have been asked to add in the Dave EK alignment stars into Alt Az Align iPhone app. I will be doing this when I get a block of free time (so maybe around Christmas).
Cheers,
Simon
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