I'm an inch taller than you and fifteen pounds lighter. I've been using a Sella SMP Lite 209 on my bikes the past couple years. Instantly, from the very first ride, there was no numbness "down there". I ride a century, metric-century, or double metric-century about once every other month the past couple years, the longest ride being 136 miles. It does get a bit sore eventually, but I've always been able to complete the rides. SMP makes various widths and padding thicknesses. There is no rhyme or rhythm to their naming convention. I finally found a web site out of Oz that explained it all. They are not inexpensive, but their warranty is pretty good.