"PW"?

You don't need to buy an upgrade if you have V3. Though there are some service releases you may want to add.

But the V3 base is of pretty limited use, without the head and body morph packs.

The newest SR (the "SAE" one) supposedly adds some expression morphs, but with the original V3 base, you couldn't even make her smile, open her mouth, or blink without the head morph pack.