Paul - the purchase price of the home doesn't matter. It can be higher or lower - BUT - it must be the new PRIMARY residence . One would need to have lived in their current home for 5 CONSECUTIVE years, out of the previous 8 years.
The new income limits do have a phase out range...for singles you can earn $125,000 for the maximum credit............it phases out at $145,000......for couples the range is $225,000-245,000.
Hope this helps
Prudential NJ Properties
To answer your question, you can check out http://www.nwihomebuyer credit.com. It is a fairly comprehensive website that I put together for our clients in Northwest Indiana.
Best of luck with your sales. It is a great time for buyers right now!