N rated tires are tested by Porsche and are specific SKUs (Stock Keeping Units or part numbers). They generally come from very large manufacturers who are willing to subsidize the testing and to produce tires to Porsche's specifications. Think Michelin, Pirelli, etc.
There are lesser known brands often from offshore manufacturers (but aren't Michelin and Pirelli offshore brands too?) that some in to Boxster community swear by as being as good or almost as good but significantly cheaper.
There is no perfect tire, all tires are compromises.
I'd suggest you ask for recommendations here but also suggest in your posting what your top priorities are in terms of wear, noise, dry handling, all-seasons, snow, wet handling, braking, cost, etc.
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