The speed grip is a useful accessory that improves the SQ-Ai's ergonomics and doesn't add appreciable weight, unlike the motorized version. Get the matching hood for the 80mm--they're not hard to find. Extra 120 backs are a bit pricey; 220s are much cheaper and work with 120 film. I like the 45 degree prism finder, a compromise between the WLF and straight 90 degree prism. Lenses like the 135mm and 180mm are great but very rare. I'm partial to the old 105/3.5S.