<< 900NF is a good monitor at a good price, it compares to the E400 not the G400 >>
In price only (that's a good thing), I've never actually seen an E400, but I'd consider the 900NF quite similar in quality to the G400. And the 900NF quite outspecs the E400. I don't know how much of a gap exsists between E and G (as I said I've never seen the E), but the 900NF is very close to the G400 and much cheaper.
I've found that the other manufacturers that use FD Trinitrons aren't as good as Sony's own monitors.
I have never tried Ilyma (sp?) though, I hear they are excellent monitors as well.