That's a tough one Kriss and we all understand where you're coming from when you mention a tight budget. I would say your best bets to determine what is a fair and reasonable offer is to look at the comparables in the area - see what similar homes have sold for in the recent months and go from there.
If you're working with an agent they would be able to provide you these comparables and give you some guidance as to how much you should offer, what you should ask for in ways of concessions, etc. They'd also be able to find more accurate comparables since currently it is pretty difficult to obtain really good comps from public online resources. If you're not working with an agent I'd highly recommend it - since you're a homebuyer you don't need to pay them any fees, they'll be making their compensation from the sale of the home. They do have a duty to serve you and your best needs, but hopefully you can find an agent you feel with whom you can feel comfortable and confident.
I know it isn't an actual value but I hope this helps in determining the final offer figure. Do let me know if you need any help! Best of luck to you.
Ellen - Tue Nov 4, 2008