Double Het projects are great!!! I have quite a few going over here...If I'm lucky I could produce a Mojave VPI True Ghost this year!

It really depends on your budget...

I would start with a couple DH females of each project you like...Multiple females are key with DH projects...Helps with the long odds.

Raise the DH females up a year or so and then look for a male...You might be able to get a Co-Dom morph DH whatever male to breed to the females...Or maybe a Visual 100% Het what ever male will be in your price range by then.

Also have you done any research on the Caramel gene... Just making sure you know about their issues before you spend a lot of money on the project.