[G4] hard drive questions

[dapper dan]

so i wish to have a bigger hard drive for my powerbook g4 867 laptop.a few 
questions:

1.external or internal.which is best and most cost efficient?im going to use 
music applications.best brands and places to buy online.

2.if i buy external and im running 0s 9.2.8 on internal and have os 10 
cds,do i need to upgrade op system on both drives?

3.also,best place (and brands) to buy memory and batteries.

thanx much
dan

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