Vinyl siding, which foam board to use?

New home being built. what is the best way to go? house will be tyvek wrapped and plan to use 1/2" foam and vinyl siding.
Wall construction2x6 walls with R-21.
Another question. before sheet rock goes on, would a vapor retarded be a positive or just not needed? Since the interior of the house will be properly ventilated with a regulated fresh air system.
1. no rigid foam board 2. square edge foam board 3. T&G foam board 4. foil faced foam board
taped joints or no tape? Is breathing a concern? Is the plywood sheathing negatively effected?
comfort is the goal, no so much cost. money effectiveness is not a major factor. don't mind if it takes 20years to pay back. (have reasons)The home is over 4,000sf.
Just looking for idea and thoughts.
Thanks. change the Capital O to a Zero b4 emailing.
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