Ok then here's my answer. If you can afford it the Pentax XW Eps would be my first choice. The XF Ep's are very good, but they only do two, 8.5mm and a 12mm. I haven't tried the Pentax zoom, some say it's brilliant, others are not so keen. At the moment I'm using a Baader zoom, which is fine, not as good as the fixed, but good enough to enjoy your birding. The XW20 gives a superb view, in both the 65mm and the 80mm scope. Next up is the Opticron HDF 40809, this gives me about 32x, it's not as good as the XW20, it's still very good, you don't feel like you are missing out on anything. Last up the Pentax XF12mm, a really nice little lens, seems to have about the same FoV as the Opticron, again gives a really nice view. I also have a 12mm BST, this is also excellent, at first I couldn't the difference between this and the XF12mm. However the Pentax stays sharp almost to the very edge and the BST doesn't. The BST loses sharpness quickly once you move away from the center. Having said that, I didn't notice it until I looked for it, and in the sweet spot it's just as good as the Pentax XF12mm. Personally I don't think you can go far wrong with any Ep in these Pentax scopes. If you want to push the boat out you can get some really wide FoV eps. Or if you're not to brothered about edge sharpness, the cheaper Eps are very good. For me, I think I will replace the Opticron for the Pentax XW14 and just have a XW20, XW14, XF12 and the Baader zoom.