. . . membership updated.

I'm going to suggest an alternative: buy an Intex pool, THIS year.

There's a good chance you are on well water . . . and are going to have to learn to deal with less than perfect fill water. You also may find that you don't like pools as much as you'd think OR that you like them MORE than you expected. With a pool like this:
Intex 32-Foot by 16-Foot by 52-Inch Rectangular Ultra Frame Pool
you can get a really good idea of what you want, what you enjoy, and what you need.

If you DO upgrade to inground, you can probably Craigslist that pool for 1/2 of what you pay for it. But you may find that you really don't want anything else.

But, if you really do want to swim laps, you may find that you want to do something wild . . . . like combine 2 of these pools into one 60' pool!

If you are already a swimmer, you know that 36' or even 40' is pretty short for lap swimming. If you aren't a good swimmer yet, once you are, you'll fine that even 60' is fairly short. My sons, who swam competitively at fairly elite levels can only take 3 or 4 strokes on 40' pool, after coming out of the turn, before they have to set up for the next flip turn. Even my wife and I find 40' too short.

But, an inground 60 - 75 pool is pricey. Maybe you're up for that.

But the joints on an Intex are lapped and glued which means it's possible -- at least in theory -- to cut the ends out of 2 pools and make 1 longer pool. As far as I know, it's never been done, but I'm kinda hoping to do it for myself and my wife summer of 2015!

There are some complications, like making drop-in turn panels. An Intex pool would not survive daily turns on the end walls, even if you use open turns rather than flip turns. And there's the issue of running 2 filter systems, or combining and adding 1 standard system. But I think it would be extremely cool to have a useable 60' lap pool for under $7,000 total!