Unless you manage to negotiate some kind of awesome deal like we did I would strongly recommend you look at something else.
Negotiating (This is what we got)
5 Bed detached with separate garage
PartEx on our old house (100% value)
£50,000 off list price (checked a few years later and all the neighbours paid full wack WTF?)
Upgraded Kitchen
Legals Paid
Garden Fenced, Turfed and Fully Landscaped (Bench, Patio, Shrubs)
Carpets throughout
Curtains throughout
Then I managed to negotiate an additional £8,000 cashback after completition. If I hadn't got all that I wouldn't have bought, simple.
When you go round, spend A LONG amount of time looking all over the house inside, outside and around the development. Take the rose tinted glasses off and look to see any potential issues.
New Builds do devalue in price so you MUST make sure you will be staying put for a good few years. Pay a snagging company to do a full check the day you move in, be careful here. Get them in ASAP!!!! Most builders give you two weeks tops to report any issues as after that and they will blame you for them. They pick up things you never will.