touchy question with lots of opinions.
I almost got that setup last summer.. I did a ton of back and forth with the AC crew, research and looking around. What I ended up with was the SLR setup because, when it came down to it, I wanted to make sure that I was covering as many bases as possible.
I bought the Stage II-IV UCAs, NISMO T-Bars, Econ sterring, and diff drop to go with the other stuff that I already had (2" shackles, 20% bilsteins at all four corners, idler arm brace and other extras). All done and said, I've felt the difference that there is now and the extra couple of hundred is like insurance.
But, that said, the AC stuff will likely carry you some distance and, worse comes to worse, you have some serious fun ahead of you. The only caveat that I'd have is the need for the diff drop.. some will say that it's not needed, but I would rather have it in place and use it than not have it and hear that 'clunk clunk' at a time when I might already be nervous about the stuff that I'm going over.