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D-Lights are great, as long as you're not looking to shorten them, because you can't. Ryan has them for a price very close to Race so it's an easy choice to make.
Personally, I wouldn't use aluminium nipples on an off-road wheel that's likely to see a fair amount of water and possibly need to be trued in the future. I've also heard that ammonia from tubeless sealant might cause accelerated corrosion too, obviously it shouldn't be in the rim bed but tapes can leak.
It's a fairly small sample size, but I've never had any problems with Sapim Polyax nipples. I have had a fair few issue with both DT Swiss and Sapim brass nipples, especially the black ones. Polyax is my default choice of spoke nipple these days.