There's a new 8ft 11 Allwave coming out - you'll be fine on it after a couple of months constant watertime....but these are surfing SUPs. YOu can paddle them on the flat but not fast that's for sure! I'm heavier than you and I have a 9ft 6 Allwave and in the surf it is a lot of fun - totally stable and a confidence builder and very easy to paddle from peak to peak no matter how choppy. Just when you are on a wave it feels a bit slow....more cruisey.
Most folk start out saying they want to surf and do a bit of flat water but in time most get a surf SUP and a flat water one.
If you want both I'd be very tempted with a Naish 10.6 as that to me looks a great longboard shape for lots of surf but also long enough for some flatwater if you really need to. To sort of SUP that is great to surf but also a nice length to get you A to B fast to try out other peaks along a wide beach. I've never surfed one but if I was after a one quiver board it would be high on the list.
More fun having a few SUPs though