Other factors? check with your Realtor. Once you put something on the contract and accepted, it will be difficult to change/correct.
Best and Happy New Year!
The way I would handle your offer is I would write an offer for $250K and ask the seller to credit you as the buyer 3% of purchase price for non-recurring and recurring closing costs. This ensures you get all the money.
Please consult with your real estate agent for professional advice. You can view available bank owned homes here in my website: http://www.bankowned.la
Present your offer (by yourself or through a realtor), and let the bank decide how they'd like to respond.