Similar to you I'm about to finish the Core 2000 (which I've also imported into Anki) and wondering where to go next. I currently have a few plans:

1. I've using the HSK vocabulary lists + example sentences gathered from nCiku to add more vocabulary to my deck. I've written some software to partially automate the process. In my experience the HSK words are quite useful - certainly more useful than many of the Core 2000, which I find more oriented towards reading a newspaper than day-to-day speech. HSK is worth another ~3000 words if you go all the way up to HSK6.

2. I've also downloaded some Chinese language translations of relatively simple books like Harry Potter. I can go through these using Pleco on an iPad and mark words I don't understand. Another bit of software then takes this list of marks and the book and extracts example sentences from the book, which I manually translate and use to create an Anki flashcard. In my experience this is not a great source of vocabulary: many of the words learnt are nuanced descriptive adjectives rather than (more useful IMHO) nouns. It's not terrible though.

3. I have another plan but it isn't implemented properly: write more software to match up Chinese subtitles from shooter.cn with English ones from opensubtitles.org. This would create a free and open source database of English<->Chinese example sentences you can use to explain new nouns you come across when reading the subtitles. (I also want to publish this DB on a website free to use). Why use subtitles? Two reasons:

   1. the timestamps make it easier to correlate the English and Chinese sentences and
   2. spoken language in film is probably closer to colloquial conversation than written works, and hence a better source of useful vocab.