Combine both by the annotator
At the time I started combining the extensive reading method with using visual mnemonics, when I encountered a character I learned before but forgot, I just checked my Anki database manually (where I have been storing the mnemonics). Until I realized it would be much faster if you could access the mnemonics directly from the text you are reading. And that is what the Annotator is for.
Note there are many tools that allow you to annotate text with pinyin and the translation, but I could not find any that would let you add your own notes to the result. So I made my own. I found it very practical, so I assume it will be of use for you as well.
Use your eBook reader
Since it is tiring to stare into a computer screen for a long time, the annotator can also produce MOBIs (for Kindle
It's a pity that most of the eInk readers are not able to play audiobooks, so you have to carry another device that can play sound. (I actually ended rooting my kindle for this purpose.) It's too bad the newer editions have no loudspeaker, so you have to stick to your portable mp3 player (or your computer).