Hi Matt,
I am fairly new to this too so maybe not the best person to advise but I do have an SB600 and it is an excellent camera. I am now looking to buy a second flash and have had
THIS one recommended.
There was a thread around here somewhere a sfew weeks ago that put me off the Jessops flash.
The SB600 will work without triggers on the CLS mode but that is not the easiest to set up. Again, I have seen
THIS video
I know that it relates to the D80 but the principle will be the same with the D7000.
Finally, I also had
THIS place recommended for reference and the quick look that I have taken so far it looks great.
Good luck with your choice, tell us what you decide and then show us the results.
Edit:-
I forgot to mention that, if you go to the Apple i-store, there are a load of free podcasts from Lastolite on there showing how to use their products.