Ryder and Taylor are both guns. You really need them to not get injured though.
Ryder, in particular.
when are the sheep-shaggers guna realise that they have no decent openers, and Vettori needs to man up and do it.
No-one can claim its too much workload, blah blah. He is a great captain, and a great bowler. He has to bat anyway, and Sobers did all three.
I would be picking an NZ team that looks something like this.
Vettori
Guptil, macIntosh, whoever
Flynn
Taylor
Ryder
How (test record is garbage, but he has SO much talent)
McCullum
Franklin
O'Brien
Patel
Martin
It bats down to 8, and has 5 top bowlers. Vettori averages 30 (better than other options they have up there), puts pressure on the other opener to perform for his spot. Middle order is very solid. Taylor and Ryder speak for themselves, and Flynn can be as good as either on his day. How as I said above has plenty of potential, and would benefit from a drop down the order to take some pressure off. McCullum is probably the 4th best keeper-bat in the world (no shame behind Sangakarra, Haddin and Dhoni). Franklin, while he has a great first class record, probably isn't a 6 as they have been playing him. Will score more test 50's than any other number 8 (Johnson excluded).
Bowling wise, they have enough seam-up firepower with Martin, O'Brien, Franklin with some support from Ryder. Vettori, Patel and support from How would be one of the best spin attacks around (Murali and Mendis would form the only attack better).
So, while it may not be ideal to have Vettori opening, it is about the best option for them atm. Frees up a slot for another batsman, while allowing them 5 frontline bowlers.