yeah, minimizing is kind of useless with expose, and especially with spaces.
quicksilver is great, but you'll find that the dock has it's own special place.
although i'm not going to lie to you - i launch 80% of my apps from Quicksilver. what a great program.
if anything, you can have a minimal dock with just finder and trash.
it's what i use in most of my spaces - however i have a full, and 'essentials' app i can select with DockSpaces.