I've had excellent results moving HP & compaq's to standard cases. Usually the lower inner corner, where the front panel connectors are, doesn't have a screwhole for that standoff that will be there. Remove the standoff from the case or insulate it so it doesnt short out the motherbd.
as for if the front panel cables will fit or not is a toss up. sometimes they use normal plugs and sometimes they don't, If they dont you can figure how the new plugs fit in by comparing the old plugs and where they went.