Bumblebees are awesome and a good start. We hoped to hatch some this year but our pastel passed. Something to consider is the nicer base morphs you get the better babies you will hatch. If you buy a brown pastel you are more likely to get brown babies. Take some time to really look into the morphs you like and decided what you like in that morph. Then go for your ideal and don't settle for a cheaper example.
Also just to throw it out there, maybe look at a spider female and a super pastel male? Or vice versa. With one being a super pastel you would be looking at 50% pastels, 50% bees as opposed to a pastel and a spider hatching 25% normals, 25% pastels, 25% spiders and 25% bees. Just a thought!