I have a before trigger that calls this class which auto assigns the region and the ownerid to the account based on the recordtype, state and zip of the region object. the region object holds all the assignments. It works great but when I execute a batch load through data laoder I hit too many script statements 200001 error. any way i can fix?

public with sharing class AccountUtilities
{
public static void acctAssign(List<Account> aList)
{
List<region__c> rList = [select id, zip_start__c, zip_end__c, state__c,sales_user__c, business_unit__c, recordTypeId from region__c];
Map<Id,RecordType> rtMap = new Map<Id,RecordType>([Select id,Name from RecordType where sObjectType IN ('Account','region__c')]);
for(Account a:aList)
{
try
{
for(integer i= 0; i< rList.size(); i++)
{
String billingPostalCode= String.valueOf(a.BillingPostalCode);
if(a.billingstate== rList.get(i).state__c && a.Protected__c != true && rtMap.get(a.recordtypeid).Name == rtMap.get(rList.get(i).recordtypeid).Name && a.business_unit__c == tList.get(i).business_unit__c)
{
if(a.billingPostalCode >= rList.get(i).zip_start__c && a.billingPostalCode<=rList.get(i).zip_end__c || rList.get(i).zip_start__c ==null && rList.get(i).zip_end__c ==null )
{
a.region__c = rList.get(i).id;
a.OwnerId = rList.get(i).sales_user__c;
}
}
}
}
catch (System.Exception e)
{
// process exception
}

}
}