Payables - Multiple Operating Units / Balancing Segment Values in single AP Deployment

Gurus

Can any one shed light on pros and cons of having Multiple Operating Units / Balancing Segment Values in single AP Deployment. For instance:

1.     I have a deployment of US Payables

2.     It rolls into my USD SOB/Ledger

3.     I acquire another US Based company (OU) 

4.     Options

1.     I integrate it in existing US Payables

1.     Create New Sites for New OU for suppliers

2.     Create New Banks for New OU

2.     I Deploy a new US 2 Payables

3.     Roll into my existing USD SOB/Ledger

Any Thoughts, draw backs , liimitations and or advantages are welcome.

rgs

sekhan