Well, a few things to consider:
Are you planning on breeding casually or seriously? Recessive gene breeding, assuming you want to propagate the morph you have, will take multiple generations and far more work. The only way around this would be to buy more than one snake of a moprh/het.. A dom./co-dom. will allow for morphs to appear in the first generation, regardless of paired snake, also tending to cost less. However, recessive morphs will hold their value longer. Consider this when picking a dom./co-dom. or recessive morph.
Also, I would suggest buying a female to start. Getting a female of breeding age/size takes longer than that of a male.
Lastly, if you plan on keeping at least some of your offspring, consider which morphs are your favourite.
I plan on buying a pinstripe male in the upcoming next year, to pair with my mojave girl.