It really depends on what you like. You will have these animals for years to come so more than anything else, they should WOW you.
Now if you are just asking what three morphs might WOW others from a purely visual standpoint? Then I would say you could probably pick up a Banana, an Ivory, and a Pastel or Lesser Orange Ghost within your budget, if they are all males. I have seen male Ivories and single gene Bananas down around the $200 mark. POGs and LOGs are probably $100 to $150 if they look nice. If you add the $150 for going over budget, you might even be able to do an Albino rather than an OG combo.