In general, I think that using actual bus boards is preferable to using flying bus cables except in smaller builds. A handful of modules on a single flying bus isn't going to create the draw issues and potential interference that loading a flying bus out totally might cause. Plus, bus boards can be had which incorporate filtering which improves noise factors, reduces interference leakage across the DC busses, and so forth. That's just not possible with a simple length of ribbon cable with some clipped-on connectors.
As for the tiles, check here: http://syinsi.com/Shop/other/ Power connections for tiles, on boards with filtering, which is pretty snazzy and definitely an improvement over the splitter-cable-off-a-16-pin previous methods.