M&J, Lately I've been seeing some early hatch 08' Spider males going for $325-$375. The ones I've seen for that price are in the 350-425 gram range, and should be ready to breed in a few months. I can't recall seeing anything larger than that recently. I'm sure others can chime in with what they've seen recently.
I think a Pastel would be an outstanding choice. Might throw some really nice looking hatchlings. A Pastel should be slightly less expensive than a Spider, but it will depend on the animal. Might want to give Adam at 8 Ball Pythons a call. He produced some nice Pastels this year, and might have some left. The one I got from him is a June hatch and could be ready to breed in couple of months.