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There are several models avaiable now. Pretty much one for every budget.
The Ipad Pro is the most expensive, but the most feature complete. Recommended for frequent use especially if you do a lot of digital art.
Ipad Air 9.7 or 10.2 are recent refreshes. Has the classic Air look but obviously the 10.2 is bigger.
Any of them now support the pencil.
I'd recommend getting anything 64GB and over.
10.2 is probably fine for 90% of people.