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Lovely monitor, the 2405. I had one from 2005 through late 2011, and it was great. Took calibration very well, but eventually the backlight started to play up and I got brightness variations, etc.
IMHO, you simply can't do without a monitor you trust implicitly. I went to a pair of U2711 monitors, which are even better than the 2405 was, so I'm very happy with them, obviously.
But you spend a LOT of time looking at your monitor, it's the foundation of everything you do in post, and they generally last a few years (if you get a good one, as you've found), so get a good one, I say.
You've already got the calibrator, so make the most of it.