If you are so torn why don’t you ask the owner to carry 100% of the paper on the home, structure a loan at a fixed rate you both agree to and move ahead in that manner?
You see that the main problem with this home, or with any other home that you are looking at has to do with your financing cost correct? That should be telling you something. The fact that you have to finance 100% of the transaction is going to cost you no matter where you buy or who you buy from if you are going to use conventional means.
Also what that other agent was telling you made sense… FOR NOW… Of course she has no other listings that are at that price. As you have seen on the board here, nobody is doubting that this is a good deal for the here and now. However many of us believe this sort of pricing will be more prevalent in the future.