Go ahead and build is my advice as well. In the process of purchasing with partner for the first time, a home is a home at the end of the day. Came down from 265k to 228k.
House prices are falling back but land isnt at the moment, because people are still looking to build rather than buy. I would however haggle as much as you can on land, as developers are not touching land at the minute and therefore the demand has reduced.
I work for a Civil Engineering and Construction company.