BennyR - just 3 or 4 shots for each stack. The only angle I could shoot at was fairly head on and I wanted to get at least some of the babies in focus.
MY PS CS2 does not do stacking in the sense you mean so I can't compare but PS should be fine for simpler stacks. I actually do do a lot of stacking in PS but that is by hand using the repair brush.
Brian v.