Warmest Mitts for Denali?

I'm planning a Denali trip for May, but I want to buy warmer mitts. Currently I've got some Mountain Equipment Fitzroy mitts, which I'm told are warmer than the OR Alti mitts.

Anyone have experience with warmer mitts? Maybe...
1. Rab 8000m expedition mitts ($175, 280g, 850FP hydrophobic down)
rab.equipment/us/shop/exped…
2. Marmot's 8000m series ($275, 360g, 700+ FP down. There's gotta be some reason the Marmots are $100 more than most other mitts, right??)?
marmot.com/products/details…
3. OR Firebrand ($290, 386g
military.outdoorresearch.co…

I was on Rainier this March, and tried wearing a pair of BD Guide split-fingers with North Face e-Tip liners and hand warmers. My hands stayed cooooold until I swapped to the mitts, so I need something warmer than the average bear uses. I've got Raynaud's and am NOT keen on losing some fingers, so the price is immaterial.

Any suggestions on warmers liners would be much appreciated, too. Or maybe it'd be better not to wear liners, so your fingers are touching in the mitt? Or contact an outdoor company about buying a pair of lobster claw liners, like mitts come with?

Thanks in advance!

Daniel

mountainproject.com/v/glove…

FWIW For the Cassin, I used BD's Mercury Mitt with wind stopper gloves underneath. They worked fine. When I dropped one of the winder stopper gloves I reversed one of the thinner gloves I had and double it up on the same hand that worked fine as well.

I hear there's some firebrand mitts for sale on mp. Word is christy mack tried them on. Pm me for details.

Outdoor Research Alti Mitts are great