tx4j? I'm not familiar with that bin.
I know that many find the X1's to be desireable. They tend to be on the warm side. I've found the light to be pretty white, but have also found hints of green when using optics.
I think that the WO and WA bins are the whitest. I also like the VO bins. They too tend to be on the warm side, but I've never had problems with green with the VO's.