Based on what I have observed, I think that Roobet is the best option currently thanks to their excellent rewards system and it is a great site for high rollers like you op. House edge of the dice game there is pretty low too and they sponsor regular contests.
Other great options include Stake as you suggested and Wolf.bet. I would still recommend Roobet over them though overall.
+1 to roobet and stake, I already tried their sites and everything is fine especially their rewards system. Of course a lot of gambling website have it for them to attract more customers but for me stake and roobet are the best when it comes to rewards. What I want in roobet is their roorewards where there is daily rakeback and weekly rewards. They have also promo where they will tweet ot post the phrase for you to get free dollar.