When you move I always feel you need a good £5,000 in your back pocket to cover estate agents, solicitors fees, surveyors, removal van, possible carpets, curtains etc, etc, not to mention at least a 10-15% deposit if no longer a first time buyer. My best advice would be to shop around for the best deals........
Moving into a new build does take away a lot of that pressure as there are often deals with regards to solicitors, deposits, you don't need to fork out for painting and decorating, selling your own house etc, white goods are generally part of that deal along with carpets and flooring, you get to choose your kitchen style etc, so moving into a new build especially if you don't have thousands in the bank are very often a great move. They are dressed to impress..........
The downside from the experience I had is the walls are thin, you definitely need wall plugs :-D cheap materials were used to make the houses our floorboards were terrible after only a few years living there, every single house on our driveway when I lived in our new build had plumbing problems at one time or another. :-(
I was happy in our new build have a lot of happy memories, and they do look really nice, the outer grounds are kept very nice too on the whole estate and you always have amenities on your doorstep they all seem to have a new build school and one of the major supermarkets, we had a 4 bed with a garage and it was on a private drive, so we were fine, however as the building work progressed the car situation got bad, the houses got closer and closer and all the two beds only had one car space sometimes 3 beds (as I've heard recentlly) also only get one car space

meaning the roads were blocked up with cars. It was like an obstacle course sometimes driving up the road to our house. :-D
If you do fancy a new build have a look on a night-time at how the place looks with the car situation, also look to see if children have somewhere to play as although there are play areas, there often are not enough and some of the roads you end up with children running around playing footie etc on the roads. They can become over-crowded with people, children and cars, however it depends whereabouts you are positioned on a new estate some have very nice spaces between houses and feel very private other areas feel cramped together, so look carefully at where your house would be. :-)
I absolutely love where I live now, I like the good quality solid walls and the peace and quiet (well until all my family come around :-D) so my preference is now not a new build, you also get more grounds for your money elsewhere, but whilst I lived there it sufficed and I do have a lot of happy memories. It was nice moving in and not having to do anything, which of course can be a downside to moving elsewhere.
Good luck in whatever you decide. :-)