The nobile NHP is a good board has lots of grip for learning and is great for freestyle riding and big airs lands really soft and handles chop better than any other nobile board. at 80kgs while still learning i would recomend the 134cm as the 132 would have to be ridden with a lot of power. The 50 fifty is allso a good board it gets on the plane a lot easyer has less rocker and is a bit more skaty but when you get on the edge it drives up wind efortlessly and rides really fast compared to the NHP. the 50 fifty is a great wake style board that loves flat watter and a low kite it has great pop meaning you can keep the kite low in tricks and you can bolt a set of wake boarding boots to it with no mods if you like. try the 139cm 50 fifty.
I regualy ride both of these boards depending on conditions and being an advanced ridder that likes wake style ridding i normaly would ride the 50 fifty with boots as i love going fast and ridding flat water with lots of power and doing all of my tricks with the kite low. The board still handles chop well but not as well as the NHP so when in chop i normally grab the NHP and go out for a freestyle session and do some loops and other kite high tricks the board lands a lot softer even when you smack in to the back of a waves or have hard fast landings when un hooked.
I would recomend the NHP for you for starters as the board is a lot easyer to ride and get up wind with the larger fins. But see if you can demo both and see what you like.