I have a 10x42 Vortex Viper bino that meets my needs very well in terms of optical performance. I would like to grab an 8x bino with equivalent optics. I was wondering if I can save money by going with a porro binocular - since I have always heard that for the price a porro should beat a roof design. Even if I don't save money I'd like to consider all my options, so I figured it would be good to learn more about porros. Any suggestions for an 8x40 or 8x30 (or similar) porro?