Multiple Loan Pre-Approvals

[Andrew Merritt]

I'm looking to purchase my first investment property soon and I'm currently getting pre-approved for a conventional mortgage.  Is it common to go to multiple lenders to get pre-approved?  I've already contacted two (my primary home is mortgaged through Quicken so I contacted them as well as another company) and I'm hesitant to contact more b/c I don't want my credit report to be pulled too many times.  Between the two companies that I've inquired with already, there's about a $100 difference in the monthly payment of mortgage, insurance, and taxes.