Looking to buy a progressive board

Hi , I am looking to buy a new board and had a few questions for the experts on this blog. I currently do not own a board and have been renting for the past 3 years, this year i got pretty serious about surfing and must have rented close to 20 times ( costed me an arm and a leg) . I started with with a 8'6 nsp, and am currently on a 7'6 nsp. I pretty much fell in love with this sport and think I am in it for the long hall. I surf the 7'6 pretty comfortably and am able to ride 4-5 green waves with minimal turning , I am looking to buy a board and would like some guidance into what to buy . Do I stick with a 7'6 or can i get a shorter pintail or fish? I eventually want to ride a short board .