Mooresville D

Hi all, I'm new at this. Can anyone help. I'm just starting to get estimates on a gunite pool approx 17 x 35'. with a spa. in the Charlotte NC area. What experience does anyone have on filtration systems (Sand, DE, or Cartridge) Also, what is the best purification system, (Chlorine, Salt/Chlorine, Ozone,) or any other purification system. What is the best pool cleaner out there. Can any of you out there recommed 1 over the other and give me some insight as to the comparisions. I am getting confliting recommendations for the different pool contractors, so I think my best source of infomation will be from those of you who have the different systems. Also can anyone give me some advice as to sub-contracting some of the work myself. Any help anyone can give me will be more then appreciated. I dont' know if the geo area affect what systems work best. Again Thanks for all your help, D

First time on a forum hope i'm doin it right. That's a big difference in cost! what all did you sub out? Did you have any problems with the pool contractor not letting you get your own subs?