That 300 watt psu will do for the 4350.
Uhh, with hdmi used with vga/dvi, i cant say i know because i have never tried it before, sorry man, but i know you can do dvi and vga and have 2 screen, of course it would have to be mirrored, but it still works. Thats just something your either have to research or test out for youself.