it will allways be best to lend from your parents as it wont affect your credit rating and they will be much more flexible with regards to payments and maybe even write off some of the debt.
as for the property being sold for more, this is complete hear say. i am just completing mine now, the property was up for 280,000 the survey came back that it was worth 250,000 due to other local property prices. the ha then down valued it straight away.
also as long as your in a stable job owning your own house is the best option. anyone with any type of business sense or or even common sense should know that rent is dead money, so good luck to you
any other help just ask, as i have first hand experience.