And by "good" I mean with minimum distortion, keeping the original shapes for the most part, etc
So far, after doing the seams, I've been doing with the best choice I can find from the various alternatives the UV/Image Editor can offer, depending on the mesh (Unwrap, Smart UV Project, Project from V, etc). Then I refine it so more with things like "Minimize stretch, and Average Islands scale". And manually straighten vertices with the old trick Scale + perpendicular coordinate direction + 0 + enter. But of course this method can take a long time, not to mention it can be tedious too.
I found a couple of seemingly great scripts at BlenderAddonList, like UV Squares, and UV Tool. But maybe due to not being updated they are not working today with 2.75a :( Either way, it occurred to me I may not be looking in the right place after all.
I thought there was a tool in Blender called "Relax UVs" in the UV/Image Editor. But I don't see it, could it be it was in 3D Studio Max? It used to do a great job, like Minimize stretch, but better.
Any pointers, ideas, suggestions, etc will be super appreciated :)
Thanks in advance guys