Favorite DBZ Clips

All mine are Goku's transformations

SSJ 1 Remastered:
http://www.youtube.com/watch?v=eMKepsqrC6I

Gohan SS2 Cell
http://www.youtube.com/watch?v=gUuzYvTItNk

SSJ 3 Goku First Time
http://www.youtube.com/watch?v=9F20IeFnG8w

SS3 Goku for the kids
http://www.youtube.com/watch?v=Osmeg5DWSdY

SSJ 3 For kid Buu (Awesome!)
http://www.youtube.com/watch?v=hpM4ngwrNX0

SS4
Low Quality but its the absolute best original episode transformation
http://www.youtube.com/watch?v=rEHI9qb_0I4

SS3 vs kidd Buu
http://www.youtube.com/watch?v=qpXJ86DOpWM

Best transformations were Goku SS1 and Gohan after he becomes SS2 (the charge up was meh), way superior to SS3 or any other power mode shown as it came with a bucket full of cold rage.

Goku SSJ3 is the second best transformation.

Some others not mentioned:

- Future Trunks SSJ v. Freeza
- Vegeta SSJ
- Gohan SSJ2 @ Tournament
- Goku and Majin Vegeta SSJ2

Gohan, Goten, Goku Kamehameha v. Broly
http://www.youtube.com/watch?v=G6BzTkMhxYE

What I'd really want to watch again is a clip of Goku powering up before The Cell Games to see how his power-level compares to Cell.

Best Transformation :

YouTube video

I like those too Chief!