spidey07:
Ask your realtor to pull comps of similar homes from say 2002 or 2003. Add inflation to that and probably get a conservative estimate of what you should pay.
Home builders have cut down their costs a lot, and unless they have a spec home already built that they want to get off books before the end of their fiscal year, they probably won't budge much.
There may be incentives they give, and they may or may not budge on price, but if you qualify for best rates (large downpayment and highest credit), I believe 30 year fixed may be as low as 4.5%.
I get John Burns Real Estate Consulting newsletter (you can sign up for his free newsletters at his website), they said if interest rates go from 4.5% - 5.5%, it equivalent to 12% increase in price, if viewed from perspective of monthly payments.
My observation from several different markets is that new home builders can offer very competitive prices, vs. already built similar homes, but may not be able to compete on price in terms of foreclosures.
A year ago, short sale list prices (if they were actually listing a bank approved price, and not some random price real baits and switches to get your attention), they were also below fair market. This year it looks like a lot of short sale list prices are very close to fair market value.
I would also ask your realtor what he thinks actual building costs and land for where you were looking at is and how much wiggle room in terms of price he or she there really is.
Especially if you are in jumbo or higher price range, cost of ownership is probably really at a historic low:
http://kcmblog.com/2011/03/14/if-prices-are-falling-why-are-the-rich-buying/
Good luck!