In an effort to help clarify which books go with which series and the best order to read them in, I've created reading order diagrams for Reflections, and The Guadel Chronicles. They aren't anything fancy, and I'll probably struggle to remember to keep them updated, so please don't hesitate to nudge me from time to time with suggestions or requests to add additional information.
The Guadel Chronicles
Reflections/Dark Reflections