What are some good problem books for someone rounding 2k. I was looking at the gokyu shumyo because of its variety, but am worried it may be a little too difficult. Maybe Kiseido's new graded go problems for dan players series? I want to get as much bang for my buck as possible, so books that have many different types of problems. Any recommendations?

Here is a huge collection by Minoru Hirada http://www.hitachi.co.jp/Sp/tsumego/index-e.html. I think the problems are suitable for sdk.

I have not read finished too many go books but I found that the Get Strong Series by Kiseido is very good. Even as a 2k, I found get books such as get strong at attacking pretty comprehensive. The book explores many game situations and incorporates life and death and tesuji as the answer.

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For a kyu, Graded Go problems for dan players is a good book to have. Other than that...I'd probably more recommend Get Strong at Tesuji, as it has an immense variety of problems and I think is a bit cheaper that the graded go problems.