I think you're cutting it really close. Strictly speaking that build only uses about 170 Watts under full load, but only having 50 watts of headroom is not recommended, especially on such a weak power supply.
I would opt for getting a 300+ watt PSU.
Something like this maybe:http://us.ncix.com/products/?sku=36517&vpn=BP350&manufacture=Antec&promoid=1030
In the end that PSU that comes with it will probably work fine. I just personally wouldn't feel safe with that little headroom.