Is seller financing making my deal too complicated?

[Steven J.]

I posted earlier about a deal I may have in the pipes that I felt I had some great ideas on but after reading posts by @Jon Holdman and The Great Debator @Bill Gulley I'm really questioning my ideas of doing seller financing on the deal. As Bill mentions in a post staying simple is just easier.

The seller in question owes 52k of the 70k its was previous assessed at. Fixed up, after a month at most, the comps suggest I could pull 80-110k as a resale. I'll stay on the lower side just to be more conservative. 

Still, the easiest method is to purchase for cash (of which I don't have but I'll find those private lenders out there that are easy to find). This would allow for a quick flip and sale.

I've been reading about how the seller financing is a decent option if there is enough equity and the plan is not to hold the property long. If I do get seller financing on the deal (whether it be sub-2, L/O, Land Contract, Trust Deed, etc) AND the note gets called due should I be worried if my flip time is one month and it takes another 60 days to sell?