Personally I'd be looking at a different male other than the super pastel - for example the pairing you've described will give u all pastels and bumblebees, whereas even if u swapped it round to a bumblebee male and a pastel female you could get the above plus a shot at a killerbee. Or there are other great combos you could put to a spider female like a lesser pastel to make queenbees... Obviously really depends on what you like and want to breed though!

One thing I would definitely consider is getting your female(s) first as these can take a looong time get up to size - I have a pastel het pied girl still stuck at the 1000g mark after getting her in 2010! That way you can hold out for the best male for the job (plus you can get breeding sized males a lot cheaper than females)