I am very pleased with my Silver Efex Pro 2, but thought I would have a look at the trial version of Topaz B&W, which I can operate as a plug-in edit to Photoshop. I was especially tantalized by the special price of $29 which is good to October 3. In my brief experimentation with the trial version (which unfortunately doesn't permit you to save any edited photos apparently unless you purchase) it looks like it would be a fairly nifty addition to SEP2, offering far more pre-sets and different editing options. However, it doesn't download directly as a Lightroom plug-in. According to Topaz instructions you also need to download and install the free Topaz Fusion application for Lightroom to have direct plug-in access to B&W Effects. And though I'm not generally stymied by semi-esoteric download and installation requirements, I can't get the Fusion/B&W Effects plug-in to work with Lightroom. So, I guess I'll just stick with SEP2. I suppose I could go from Lightroom to Photoshop to B&W Effects for editing, but I don't want the hassle of then trying to get the final edit to save in Lightroom without needing to go to the Lightroom Export and Import route.
CORRECTION: I have learned that you can get a free key code that gives you a full-featured version for use for 30 days. I did get this code and installed it, and now it works as a direct Lightroom plug-in. But the process for this Lightroom installation was fairly complicated, but there are detailed instructions in Topaz, which must be followed quite precisely.