This is just my personal opinion, but I would start with a female pastel, and a male spider. That way you keep your cost down in your first season, but you have the potential to make bumble bee's which are a very hot morph, and sell rather well.

Compaired to other morphs and het pairs I think this is the best way to go.

Female Pastel - $325-$500 depending on size
Male Spider - $300-$500 depending on size

So you are looking at spending around $1000 top end, and some het pairs cost as much or more than that. So I would go this way first, but you can do what you like.