yea that light looks ok to me says reef compatible and that is a really good price. and should be plenty of light for soft corals and lps.
and as for sumps have you thought about adding a refugium ? thats the next thing im going to add. and if you make a sump you should add a place in the sump for one even if you arnt planing on having one at first.
this will explain
after watching that heres a few more