Don't be too quick to downsize too fast. I'm the same height and weight that you are and I learned on a Manta 230. With 20 jumps I started to purchase my own gear. My instructors all recommended that I buy a Sabre 2 150. Even at less than a 1:1 wing loading, this was a fast canopy for me. 14 Jumps and 4 crash landings later I put my Sabre 2 up for sale and purchased a Spectre 170. I would have bought a 190 but it wouldn't fit into my container. It's been an expensive and valuable learning experience. Do what you want but I would advise to downsize slowly. Good Luck!