Color gamut of 82% isn't really considered inferior. Normal color gamut is 72% while wide color gamut can be as high as 97%. The wide color gamut makes colors a little more greenish, but the benefit is for color printouts. Assuming both printer and monitor are properly calibrated, wide color gamut makes it easier for both displayed and printed colors to be the same.
LED backlit monitors have a color gamut of 68% which makes colors a little bluish. There is no benefit in any application so LED backlight would be considered inferior.
Dell has been know for having periodic sales, but nothing guarantees that prices will dip that low again. You can wait and wait and wait, but if you wait long enough those monitors just might go out of production and you loose your chance of buying one.
I doubt prices will drop that low again. Inflation is starting to creep up which means manufacturing costs are starting to go up.