Like Lawson and Dwayne, for minimal complexity and ease of build as well as on the wallet, I would also go for either a Niueport 11, 16 or a 17 in 48th.
SMER handles the 11 and 16 nicely (they can be built from the same kit), where as Dwayne mentioned Testors has the 17.
SMER improved the old Aurora kit by adding an optional headrest for the 16 varient, as well as a nice boss so the rotaty engine actually rotates!
The reason we recommend this series is that with the sesquiplane Nieuport series, the rear cabane strut is triangular, and thus esentially self-aligning as are the "V" shaped interplane struts.
So you start out building it as a lower-winged monoplane, and go from there.
As for rigging, for something that small at that scale, I would say it is optional, since in fact if you look at WWI photos, usually the rigging is invisible from any distance.
Now the SPAD, again you should have inverted "V" cabane struts as well as the one-piece "H" shaped interplane cable supports (often mis-labeled as inner interplane struts) that help in aligning the upper and lower wings correctly.
Personally, unlike their Nieuport 17, I don't care for Testors SPAD 13, with their toothpick machine guns, etc, so you might look at the Glencoe release, as it is basically a resurrection of the old Aurora kit and goes together nicely.
Now for the SPAD, I definately wold consider rigging, especially since the main wing span-wise cross-bracing cables are distinctly heavier then the rest of the aircraft's rigging.
Eddie