Actually, the D14 should come with the NT-H1, and it's very good, but it's definitely not the BEST paste out there. The differences between the top ten or fifteen thermal pastes is pretty minimal though, so I wouldn't base any purchasing decisions on that. If you buy paste, and are not looking for a specialty paste like the liquid metal varieties, then I'd highly recommend the Thermal grizzly Kryonaut. The Noctua NT-H1 and now superceded by the improved NT-H2, are both perfectly fine for any system though.
As to the coolers, are you talking about the Dark Rock 4 or the Dark Rock Pro 4, because they are definitely not the same when it comes to performance. Even so, the Dark Rock Pro 4 has slightly worse numbers than the D14, especially if you want to go all in and do something like this, which will pretty much give you as much performance as is currently available from an air cooler, but is a little costly after you factor in the cost of fans.
Various combinations of fans were tried on the NH-D14, especially the NF-A15 and the NF-A14. We found a winner.
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