I would also suggest the the visual x visual to get your own double hets. There's no guess work on whether the babies will be hets or not. Even if you cant do both visuals I'd suggest one of them be a visual that way the babies will be 100% het for at least one of the genes. You can get visual axanthics for $350-$400, and visual pieds for between $450-$700.
With my own double recessive project I'm aiming for Ultramel Pied, A visual ultramel was way out of my price range and female double hets were pretty much non-existant on the market, if anybody had them they surely weren't letting them go. So I'm going the route of Double het male x Visual pied female. From that paring I'd hope to get some female pieds poss het ultramel to pair back to the double het male. I'd also hold onto a male pied if I got any just to maybe try and prove out later.
Even if those females didn't prove I still got good adds at producing more pieds, and 100% hets, and more pieds is never a bad thing.