Film for B&W Nature

After years of shooting nature with color film (mostly Velvia), I've taken the plunge into medium format (used Rolleiflex) and want to pursue B&W. I typically pursue landscape shots with a great deal of depth of field (thus long exposures @f11-f16). When I enlarge color I usually go, if the transparency warrants, up to 11x14, rarely to 16x20. With this in mind, what would be a recommended fine grained film to begin my foray into B&W. By the way, I don't do my own darkroom work and any enlargements would be done by a pro custom lab. Thanks, Chuck

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