I'd go for a Tokina AT-X 11-16
Simply the best ultra-wide lens for crop cameras.
Check the reviews for those lenses. They blow everything else away, and they don't have as much coma as the Tokina. It is a good lens, but coma is a problem with stars.
System
ASUS Z170-Pro
Skylake i7-6700K @ 4600 Mhz
MSI GTX 1070 Armor OC
32 GB G.Skill Ripjaws V
Samsung 850 EVO (2)
EVGA SuperNOVA 650 G2
Corsair Hydro H90
NZXT S340
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