My friend is trying to talk me into Whidden Dies. So, $110 for the Forster or $180 for the Whidden. Will I notice a difference? Probably not. But Whidden makes good stuff.
If you want to pay big money, there are also Neil Jones and Alan Warner. I have some Neil Jones dies, and they work well are are finely made. The ammo I make with them shoots great. I also have a couple of sets of LEE dies that are NOT finely made, but I can load great shooting ammo with them as well.
The difference comes in control when setting up the dies. The Warner die is extreme in this respect, but so is the price. Will you benefit from having precise control over your headspace and being able to adjust it measured -/+ .001" increments vs. going by feel?
It sounds good, but for the $200 price difference over the Redding or Forster's I can load 500 rounds of ammo to practice reading the wind and mirage. Shooting at 1000 yards, being able to tell a 12mph wind from a 10mph wind is more important than .10 MOA better groups.
I find the standard dies from R or F to be good enough. Better will not hurt if you have the money and understand what you are getting for it.