Ry
Explorer
There's another thing: If you want to pull things from different sources, but you have worries about how the balance works around, say, 12th level... well, you can stop worrying 
There's a lot of considerations about how these different options do or don't work together (for example, what if you up you multiclass, take feats to catch up your casting, then take 7th level with your caster class? I think we all know what we'd suggest, but it starts to get clunky), and the more I look at them the more I think the best way to do E6 would be to take Basic E6 and then make the rest of the decisions based on your group.
That nicely comes back to why I came back to E6 after spending ages devving my own RPG: Sometimes it just has to be close enough, and it's time to stop devving, stop building, stop putting off the session because you're not ready, and get playing.

There's a lot of considerations about how these different options do or don't work together (for example, what if you up you multiclass, take feats to catch up your casting, then take 7th level with your caster class? I think we all know what we'd suggest, but it starts to get clunky), and the more I look at them the more I think the best way to do E6 would be to take Basic E6 and then make the rest of the decisions based on your group.
That nicely comes back to why I came back to E6 after spending ages devving my own RPG: Sometimes it just has to be close enough, and it's time to stop devving, stop building, stop putting off the session because you're not ready, and get playing.