Please prepare very carefully when purchasing a fire suit. #1 where do you want to end up? (speed, blown or unblown)That should tell you to by a -20. Consider your size. I bought my first one at age 30, I'm 64 now and sure don't look like I did back then.
My personal thought on chutes is "think smaller" remember this is MY opinion not any manufactueres. Pop a 12" cross form at 200 and hold on to your neck. I use a smaller tri-form from a old supplier (gone now) and choke it down. It works great tat El Mirage and Bonneville both.
Consider how you want your belts to work. I know what I want (tighten up or tighten down) all things to think about.
Like the other guys said please consider or sponsors and Ads first. They support us we should support them...Good Luck