What should I be aiming for? 

Two other things I find handy are a welcome mat to wipe feet particularly in bad weather and a tape measure.

The buyer's list how to thread is aimed at wholesalers, but is relevant if you truly have good deals.Hopefully there are no words like tape, NCND, "direct to seller", LOI, POF and other such buzz words involved.

I'd also suggest you aim higher than one house with seller financing!

as someone previously said, I aim to be attractive to my ideal tenant.

I think is best to aim something above $100k in good neighborhood.2.

However, if it became apparent that this person did not intend to share any of the chips, then I would go back into full ruthless zero-sum mode and up my game until I can grab all the chips as fast as possible, and more for good measure (having someone make a grab for all my chips does wonderful things to my brain).

That's mostly a feeling, as I don't know how to measure that or what the average appreciation for a fourplex is in our area.

(i.e. within 150 miles of the collateral property)I'm following up on the contacts Mike provided (thanks again Mike) so as to shop around as Dion rightfully suggests (thanks Dion for reiterating that successful REI is heavily dependent on controlling costs) My aim is to find a solution that does not require "local" contacts of any kind; AND has all the provisions that are suggested in your replies.  

They didn't minus their property tax so it looks like their net was around 20kBTW we are aiming for 280k for the property Thnx in advance