Not meaning to be a party pooper but if you have photoshop I think the best thing to do is to learn how to do the conversions yourself. Silver efex is a nice tool but it seems as if people use it without understanding how it is changing the luminance in particular areas, the contrast, how it is creating that 'silver efex look' .. And I believe that understanding how your software is doing these things is essential to improving, twiddling sliders in efex is dandy but once you know what tools you need to get a certain look in photoshop its not much hassle at all and gives you a much tighter grip over the end product. Knowing exactly what you need to do afterwards may change your entire outlook on how you shoot the image in the first place.