Just get one of the Dell IPS panels for a good price on Amazon. They work great.
I can't help but wonder if perhaps the issue is with your eyes. I don't mean to be facetious, but I found my woes with the MBA screen disappeared once I updated my prescription recently. Weird how that works.
Haha! I probably need to think about glasses for my computer monitor viewing but my old ASUS 15" monitor was and is fine (apart from it freezing every 5 minutes). I could use it all day which is why I kept it for seven years. But it's taking its last agonal gasps now