You started off by saying price isnt an issue now your saying nothing over $600...so which is it lol?
If i were you i would get 2 single morph females now. Like a pinstripe and a lesser. That would be $500-600. Then in 2 years get a 2 gene male like a lesserbee or pewter or bumblebee. Wait 1 more year and you'll have 3 breeding size snakes.