Heritageless Stud Price Check - Luna base - 6m total: 2x Merle, 2x Inuit

Hi everyone! I'm currently building a stud, and while I'm very proud of them so far, I have no idea how I should price them. Their major draws are the lack of any traceable heritage, the Luna base, and their uncommon markings. Unfortunately, they're not a carrier for anything. 

Here's a link to their page. Their stats are fairly low right now, but I'm planning to build them up to at least the 350-400 range before making them a public stud. I'm also going to add a Luna marking prior to public studding, bumping them up to 7m. 

Any help would be appreciated! I'm completely new to the world of studding on WD and would appreciate some pointers.