A few questions / comments for you... I am a design consultant for swimming pool builders, landscape architects, and homeowners helping them wade through the often murky waters of swimming pool builder jargon among other issues like hydraulic design and engineering coordination.

I don't have much experience with vinyl pools, but can give some input on a few items in your list.

1. Is your heater specified as an electric heat pump or Propane Heater?

2. What is the "auto-cleaner"? There are numerous manufacturers of robotic cleaners, with a litany of price & quality levels.

3. Since you have a salt system specified along with a diving board, basketball hoop, rails, ladder, and slide, you need to be sure the specified items are designed by the manufacturer to resist corrosion. Check out the manufacturer information to be sure, most like SR Smith have decent websites where you can find the "salt pool" or "corrosion resistant" options.

4. Does the price for the winter cover include installation? Many builders will include the winter cover, then charge for the installation & installation hardware separately.

5. For ease of long term maintenance, water clarity, and pump longevity, it's important to know the size of the sand filter... and in my opinion consider a filtration method with higher flow rates like a Cartridge filter... Consider the flow rates through the pipes (ask what size the pipes will be), and then compare with the filter chosen. I know this may sound ridiculous to go through the effort, but it's extremely important for longevity and often overlooked by code officials and pool builders alike. If your pump's location and water demands result in 90 gpm of flow, and you have the pipes sized at 1.5", you will exceed the allowable pipe velocities on both suction and return piping, depending on how it's plumbed....The big issue though will be the filter unless it's sized appropriately. The maximum flow rate listed in Haywards manual for the S310T2 and S360T2T (just to choose one), with 1.5" plumbing is 45 GPM, and with 2" plumbing 80 GPM... you may not have a problem with 2", but in my opinion it's not worth the hassle. You could eliminate backwashing with a cartridge type filter, like the Hayward Swim Clear mid-sized version, and be able to move the water through at higher flow rates, so the pump doesn't have to work so hard. If you have the Hayward Super II pump, it's known as one of the "unkillables" out there, as it notoriously can weather quite a bit of abuse. But why abuse it in the first place? You have the opportunity to do it right from the start.

6. Were you given an option for a Hayward Variable Speed pump? If not, please be sure to ask. It can cost more on the front end, but will be much quieter, and draw less electricity.

7. Will the pump be SRVRS protected, and the drains compliant with VGB? see this link for more info than you'd ever want regarding pool safety: http://www.poolsafely.gov/

Wow, I really blabbered on there for awhile. Hopefully this helps. Best of luck on your project.

Scott