If youre going to use the asus z77 mobo, im pretty sure all tower coolers will fit, even with a graphics card inside the Node 304. It will even fit a Phanteks TC14 ora Noctua D14 inside the Node 304.
GTX 670 will surely be able to fit inside the Node 304, but it usually depends on the PSU. Usually people get the Seasonic G series as their PSU since they are semi modular, and the sockets are placed at the bottom. I've seen builds that has a Titan, GTX 690, 7970 Lightning (me), and other long graphics cards inside the Node 304, so the 670 shouldn't be a problem.
The Silverstone PSU you mentioned should be a good choice as well, since it is smaller than the average PSUs out there. You won't have any problems fitting anything inside the Node 304. You can also have the option to buy PP05 cables, which are shorter than the standard ones.
thx for the info.......are the pp05 cables sold though silver stone? or can i find them else where? i might have to think the seasonic g series over. they are priced alot better and i'm sure quality would be as good?
if my u14s would fit in there, that would be pretty sweet