The Hayward AQR 15 with the T-15 cell sells for less than $1k online. Gives you a 3 year full warranty, not prorated. So if the cell dies, you get a new one. It's a proven, tried and true, unit. Rated for up to 40k pools.
Yes, it does have a known common issue with a possible failure of an input resistor, but a $2.50 part and 15 min with a soldering iron takes care of that if it happens.
Many, many here are using one, so info is readily avail on the forum. I've had one in service for over ten years now. Very happy with it. I got 7+ years on the original cell before replacement.