GHI Mojave Ghost is a gorgeous combo. I'd stay away from adding a second recessive to the mix as a new breeder. Champagne and Ghost look especially nice together imho, but you have to be careful what else you breed Champagne to if you continue the project for generations, as it can lead to wobble issues like Spiders have in certain combos. If it were me I'd probably want to experiment with Red Stripe and Leopard and see how Ghost looks with different combos between those and yours.
GHI can sometimes counteract BEL to an extent and make something really cool looking with Ghost, but it's not a sure deal, so not something I'd mess with as a new breeder either. I'd want to take time to find really low-expression Mojave for a project like that for the best looks if I was dead set on trying to make those.