Im just starting running again after about 3 years, the problem is i have "Flat Feet" i went to a running shop last time and they said the best for me are brookes beast's but i found the very very heavy which in turn made my shines hurt so i went and got myself a pair of nike pegasus which are ok and i still use now, was just wondering if theres any better light weight cushion shoes that would be good for me?

Whilst I can't recommend any myself... it may well be worth you trying another running shop, they should be able to suggest a number of suitable options which you can try on there and then for comfort.