Seller Financing Vs Conventional for first time rental w/caveat

[Jonathan Davis]

BP, I have a great opportunity to purchase a home being sold by my in laws.  They are pricing the home well below market value if it's sold within the family.  I'm a new RE investor and feel like this would be a great first property to add to my buy and hold portfolio.  

My question is, would it be advantageous for me to convince them to Seller Finance the home to me?  That way I'll still have lots of opportunity to purchase future investment properties in the near future via conventional financing? I've heard frequently on the podcast about investors having difficulty obtaining conventional financing after purchasing their first several investment properties, therefore, I figured avoiding a bank for my first property might provide me with additional conventional financing availability in the future. 

Thanks for helping to get this newbie going!