I personally went for certainty than the amount when selling - because i needed assurance of paying my committments than making max profit at the time.
This is where you really need to get into the head of the vendor - why they are selling.
Remember as a vendor, the minute you accept a...
There's a lot of psychoogy involved in putting in the offer.
Consider from the vendor's side:
lowish offer, 10% down, unconditional
highish offer, $500 down, conditional on bank, inspeciton, etc etc etc
Which would you accept?
The Y-man