it sounds like the bindings are coming with the board. if that is the case, go for it. if you are buying the freestyles separately, id suggest a more responsive model unless your getting them cheap. as for placement, a good starting ground is take the bindings off, stand on the board and do a squat. whatever placement and angle gives you good stability and comfort is what your after.
at 5'11 and 160, a 151 is going to be a definite park/jib board. im 5'8, 145 and use a 156 board for park and carving.
Thanks for the reply! So regarding that this board will be a definite park/jib board...could i still use it for say a free ride or carving? Also does a few cm make a huge difference?
BTW the freestyle bindings that come with the board have toe cap technology.