Some of the "lower end" visual stuff is as follows, and are at market price around $1500 or lower:

Spiders (Dominant)
Mojaves (Codominant)
Pastels (Codominant)
Yellowbellies (Codominant)
Albinos (Recessive)
Cinnamons (Codominant)
Black Pastels (Codominant)
Ghosts (Recessive)

These are the more common morphs available. I'm sure there are more that I am not thinking of at this moment, but all of these are good animals to start with.

Do what you love... Not what is the "best investment".

You will be sorely dissapointed if you are only in it for the money.