Depending on the number of snakes you get, food alone will consume your current budget.
As was mentioned before, factor in racks, electricity, thermostats etc... as well.
Honestly, you also need a buffer for possible vet visits.
ALL of that and still have not budgeted an animal, or animals in the case of breeding (need at least 2 ).
As far as morphs, find what you like within your budget and get the BEST EXAMPLE you can find. Quality in, quality out. As long as you are working with quality, it does not matter where you start on the morph ladder.