I read an article years ago that compared the accuracy of reloading dies. Their conclusion was that the dies had a minimal effect on accuracy. It's really up to the end-user and steps taken. That said, you should look for features you'll appreciate and enjoy. This way, you'll make the most accurate loads you can...
I have used many different sets and they all have their merits - some are better or easier to use than others.
The Redding bushing dies are great - you can easily control neck tension with them. A micrometer top can be good but the screw/nut arrangement on standard RCBS dies works too. This has not affected accuracy for me...
I really like the Forster 'Bench Rest Seater Die' - without a micrometer. It's adjustable with your fingers and is quick and easy to adjust. If you want to spend the Extra $20, it is available with a micrometer top. The one I'm using was US$36.20 from Sinclair. An awesome die for a reasonable price.
You'll need a FL resizing die no matter what. If you neck size, that's fine but I like to FL resize before the first firing - then you can neck size for use in the same rifle. Some Bench Rest shooters are using nothing but FL resizing dies - all the time. I still neck size on occasion depending what I want to do...
Good luck - SD