Do you already have PLC experience?
Are there already PLCs in use in your location? If so, what are they? You might want to consider continuing with that platform for consistency.
Which PLCs are sold in your area? If AB isn't available, it won't make sense for us to suggest AB...
How do you desire to interface with the load cells? Will they be providing an analog signal (0-10V, 4-20ma) or will they be communicating via one of the many industrial communication protocols (if so, which one -- DeviceNet, EtherNet, Profibus, etc...)?
How many I/O points are you going to require?
There are many, many different PLCs that can do the job you outline. We need to know a lot more about your requirements and what's available before we can make a reasonable recommendation.