Don't do it. Your dimensions are almost exactly like mine. I fought through 2 17.5 inch bikes last year since the LBS did nothing to deter me. I went by clearance over the top tube only and this will not work if you have short legs and a long body. I now ride two 54 cm (21 inch) road framed bikes and am much more comfy. If you're looking for a hybrid the geometry on the Gary Fisher bikes from Trek are made well for our type of bodies. I test rode (Wingra) one since my 17.5 inch bikes were Treks and liked them other than the size. If I wanted a flat bar I would have gone with it but I'm finding that drop bar bikes feel really good to me. I look at my cyclocross bike as my hybrid.