I got a job in one oil servicing company in Port Harcourt and I'm supposed to start on Monday 26th March 2012.
The problem I have in deciding to move is that my wife is neither objecting or approving it.
They will pay me N100,000 for a start and promised to increase it after training and probation period of 4 months. However I can comfortably make N70,000 every month now in Owerri where I live with my family of 5 and my wife can comfortably make N80,000 every month.

My question is does this job and it prospest worth leaving my family and maintaining two family.

Make ur final decision on ur knees!

Taking the job means:

You have to move to PH alone until after ur probation.You can visit your family on weekends,since Owerri is not too far from PH.

Accommodation options:
Rent, a self contain apartment which is over 100k,or
live in a free company accom or hotel ,if it is available,find out
or if u have a friend close to ur office where u can live temporarily until ur probation period is over.

Complete relocation is only possible after the pp and u r certain of being in the coy for over a year. Before then,have a spacious family size apartment and be find a good shop for madam.As for her customer base,over time she will build a better one by God`s grace.
Finally,believe in God that He is taking you to another level.PH might be expensive but remember your Father is Richer,The earth is the Lord`s. see you at the Top.

What about your children? They will need fatherly care, can your wife do it alone?
However,Make your final decision on your knees. God can see the end from the beginning.
God bless you. God2man.

One thing I know is that my wife wouldn't want to relocate because of her business prospects in Owerri and I have Rowdy Children which I don't think she can scope in shaping their behavior in godliness and righteousness single handedly.

Again before marriage I was never a fan of maintaining two homes and was vocal about it

You don't need a Christian angle to this.
The answer is NO!
You have children to raise. . . and your wife cannot do that alone.

From all human angle as per you explanation the answer is No, But that is human reasoning angle,

Now look inward into God in prayer,
what is your innermost being saying,
find where your inner peace lie sincerely
With a sincere waiting upon the Lord and praying
Then follow where you have the most inner peace in your earth with God

That is the answer you need

You are blessed! May God be with you. Trust in God that whatever decision you make he will be there fully to back it up because you are His child.