Video Question- Manual White Balance

[Leftridge]

I'm running a a Sony FX1 and am trying to decide if I need to start running manual white balance in the field or if the presets are the way to go; adjusting colors in post production?

I'm trying to get as good an image as possible, obviously, and am not sure how often I'd need to take a new WB with the light conditions changing so much in the morning and late evening.

What to ya'll do in your filming?

Here is a sample of a color adjust I did in post with Sony Vegas.

http://www.youtube.com/watch?v=URk1vWq4P5g

Here is a sample of video i did with no ajustment to color in post..

http://www.youtube.com/watch?v=z80Suddt2xw

It seems like I can get pretty good adjustment of color in post..

Thanks for the advice!