as long as your ECU knows it's running 700cc injectors (as well as the latency time), you can run whatever turbo setup you want. Injectors are variable, they're not 100% all the time. So I'd say it's smart to go with injectors you'll grow into, rather than the perfect fit now, and then have to replace those later on.
I've been told that Sards will fit into a stock rail, with a bit of vaseline or something on the ends - I've got those exact injectors on order and I have a stock rail - nothing I've heard or read indicates that the Sards won't fit. Might cause some cussing to get them in, but they're supposed to fit.