Buy one that also functions as a time machine. Might be more than 6k though.
But, on a more serious note - the chemical balance in these things is (or was) a complete bitch to balance and maintain. Had one for a few years back in 07/08ish. Looking back, should have just paid a pool-boy to come out once a week or something to make sure it was done correctly. Small amount of water in them, so over-dosing is pretty easy to do and then you have to put some other thing in to balance, etc etc.
Definitely look into what the pool/spa store recommends for a chemical treatment regimen, or get a pool boy.
It was nice to own, particularly initially, but didn't use it all that much to be fair over time - the first 6 months was all the time, but then even after workouts and whatnot, it just didn't get used much. So, really weigh how often you want to use it versus cost.