I have been looking for dual 27" setup recently, as well. There are some great offerings in the $400-$500 range, but my big concern is finding one that has display port 1.4 ... I really like the look of some of the asus tuf monitors, but not all features are available over display port, because they have dp 1.2... hoping someone on here can help!
Here is the asus I was looking at:
ASUS TUF Gaming VG27AQL1A
LTT just did a video recommending the LG 27GN950, or its predecessor, the LG 27GL850, the latter of which looks good for my price range, but pretty sure its not going to have DP 1.4...