I'm doing the core 2k (currently at the 400 vocab now) and I need a book or resource with lots of sentence with progressing difficulty level? Something like the sentences on the 2k in a batch so I can keep practicing and used to the sentence/grammar structure with contents? (if have furugana will be plus)

I don't know of anything like that. I think that trying some simple native materials would be a good next step after finishing the Core 2k deck. Finish one of the larger Core decks might be appropriate. I used other approaches, so I don't have experience with reading with just the Core 2K studied.

[s0apgun]

maybe something like this? or a graded reader

http://www.amazon.com/dp/499028481X/ref=...6416DK47WH

only other resource thats going to get progressively harder would be textbooks