I just happen to mention to another Blitz member a few days ago about Leipzig, so the timing of your question couldn't have been better.
I own the whole NAP series and from my POV Leipzig is my favorite JTS NAP title.
It is very well put together, includes alot of extra PDF documentation like uniforms and leaders, Scenario Strategy Guide, Terrain Effects Chart, Weapons Effect Chart, Prussian Regular, Garde and Reserve Regiment Listing, and also includes planning maps.
Most importantly, Leipzig has a different feel to it, in a good way, when playing it that I don't "feel" in other titles.
I too, would highly recommend you get Leipzig.
You will not be disappointed with it.
Feel free to take a look at all the Leipzig scenarios listed in our database. As you will easily see, you will get alot of bang for your dollar, with this title!
http://johntillersoftware.com/Napoleonic...ipzig.html
http://john-tiller-software.myshopify.co...gn-Leipzig