best in class for what?
there are a lot of best in class.
And are you limiting yourself to only M.2 or is U2 also on the table.
For gaming the best in price / performance ratio is a Intel P4500 4TB which you can find on ebay new for roughly 400-475 dollars.
4TB of NVMe, but its on a U2 format, so you need a U2 adapter for your M.2 port and you also need a U2 cable.
But 4TB should keep your game drives happy, and not full since games are being bloated now a days ranging from 50-150gb each title.
But you fail to ask what your going to do with the NVMe.
IF money is no object, and your going full bling bling, nothing is faster then the Intel P905 series, but again, the price to performance ratio is not even on a reasonable level, that your probably better off getting a sammy 970 PRO and missing out on that extra 4k speed the 905p has.