At 1300 on the old RTK1. So it is time to start looking at the next step as I figure I should be done soonish.

The workbook I am guessing is a must get.
Is there any other texts/answer guides etc.

Should I get the A Dictionary of Basic Japanese Grammar
Should I get the N5 level KM books [JLPT is my number 1 goal and I hear the books are not cumulative].
A dictionary of some sort.

Or should I wait on these.

I'd say yes to all except maybe the N5 guide - I think N5 is so easy you don't really need a guide (in fact you could probably already pass it if you know some "watashi wa" Japanese). But the higher the level the more worthwhile these guides are - at N4 they can be helpful, and at N3 and higher they are a must.

Be sure to check the JLPT materials out before you order them - Japanese-style textbooks are kinda unfriendly if you aren't used to them, and there are different Nouken guides available, not just the Kanzen Master series.

Hmm, it might be best not to buy too much at once so you can concentrate on what you have. I'd recommend just going through Genki 1 and reviewing RTK for the time being. I'd work on Genki 1, then Genki 2, and then see where you want to go from there. You could consider purchasing the Dictionary of Basic Japanese Grammar if you find the grammar explanations in Genki confusing.

As for JLPT guides, I'm not sure how necessary they are for N5 and N4, since basic textbooks cover all that stuff pretty well. I think N3 is really where you need to start studying specifically for the tests, and that's beyond the level covered in Genki 2.

I think for N4 a vocabulary list and some listening practice would help, but you don't need a JLPT guide for those.

Make sure that your copy of Genki includes the audio CD. There are cheaper new editions that don't have it, and used editions may have lost it. Even if you're primarily interested in the written language, it's still important to establish a good sense of how the language sounds early on so that you can 'hear' correctly in your mind the words that you're reading. Plus, of course, there is a listening portion to the JLPT.

Oh, and here's a dictionary for you,
http://dictionary.goo.ne.jp/en/
The Shogakukan Progressive was my paper dictionary back in the day, and is what goo uses. I don't see any reason to own a paper dictionary anymore when I have web access from my phone and there are free lookup services all over.

I found that dictionary very confusing to use, perhaps when I am further along I will be able to make sense of it.
As for CDs, thanks for the heads up, I knew of the issue but it is good to get a reminder.

While I am semi on the topic. What does one have to know about Kanji for the JLPT.
Is it just in the context of other words or are they tested by themselves.