Lots of good info, newflasker! I think I like your ideas on venting for pressure equalization. I cringe when I hear a sterile mother flask pull air in.
Gin, From what I understand, the most important reason is newflaker's #3. Replate media will grow your plants faster. Germination media is much leaner as far as nutrients go.
Lots of knowledgeable people on the board! I'm sure you'll figure it out.
Just let us know what works.