AN is an excellent product, but I recommend standalone Trib be used first to "baseline" your future comparisons. In that category, I like both Tribestan and Vemo's Bulgarian Trib. Tonvara's Tribulus Alatus should also be on your radar, as the data surrounding its abilty to boost test higher vs. Tribulus Terrestris is quite interesting. Once you've established what the standalone stuff can do for you, you can then see if combo products (w/Longjax, DHEA, Suma/Rhaponticum etc.) outperform it. You can also determine if the additional costs of said products is worth it*. Right now, I'm using Tribestan and find it extremely consistent. I've been using it on and off since its introduction into the US Market circa the early 90's.
* I do feel strongly that quality Trib/Ecdysterone is about as good a 1-2 punch as you can get, at least from truly natural products. Will you see steroid like results? No, but you for sure will recover much faster from high intensity exercise, improve your work capacity and also improve your bloodwork (i.e. Ecdy is dynamite for lowering blood sugar, as well as cholesterol). Along w/ creatine and EAA's, most athletes would do well to adapt this combo.
EDIT: I'm told by Danes (someone with more Ecdy/Trib experience than virtually anyone here) that Tribulyze is also excellent. Although I haven't used it, I value his opinion quite highly. That might be another option for you, at least insofar as standalone Trib is concerned.