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Unless you have a reason to lower your compression there is no reason to get a thicker headgasket. Especially if your running stock bottom end I would not lower the compression, stock pistons are 8.3:1, if anything I'd go with a smaller headgasket to raise compression. If you have the head shaved and it's still within spec there is still no reason for a thicker headgasket. If your head is shaved enough that you need to compensate with a thicker headgasket then it's time for a new head.
Def get some ARP studs or at the very minimium some new stock head bolts. Don't reuse your stock bolts, they stretch.
It's a good idea to get the head shaved when you replace the head gasket with a metal one to ensure a perfectly flat mating surface so that you get a good seal.
You should be fine with the 1.1mm.
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