"Now let's..." vs "Let's now..." -- what is the proper sequence?

Question

Let's now take a look at the birds in the cage.

Now let's take a look at the birds in the cage.

Which of these two sentences is correct? Why?

Answer 1

I don’t think either is improper, the broader context may suggest one is more natural, but syntax can be a very personal thing.

I would only use the first in the following:

“Given that previous results show that free range birds had very few infections, let's now take a look at the birds in the cage.”

I would use either in the following:

“We have just finished looking at the free range birds, now let's (let's now) take a look at the birds in the cage.”