Trouble with MBP 15" and external display

ahh, the joy of a new display...
I just received my NEC 20wmgx2 (20" widescreen 1680x1050), a fantastic little monitor, with a little problem.
I cannot get this display to work properly with my macbook pro.
If I use DVI (DVI out to DVI in)
The external stays blank, and says no signal, the laptop display blinks, like it sees something is there, but even after clicking 'detect displays' nothing shows up.
If I use VGA (DVI->VGA adapter->VGA in)
Ok, now I have a picture, however the correct resolution is not on the list, all I have are typical non-widescreen resolutions.
Using third party software (switcresX) I am able to force the correct resolution option to get it to run at the right res.
However this is not an ideal solution by any means, and I would like to be able to run this monitor from dvi, no adapters, as I suspect that would be the best quality, and also avoid odd third party resolution hacks.
My question is then, does anyone have any idea why the macbook would not register the monitor correctly, or what I might try to do to get things on track?

I'm on looking for a solution, but I can only get my external Viewsonic working if I methodically unplug and replug in the monitor cord to the MBP 4-5 times. Try unplugging it (wait for the flash) and replugging it in (again - wait for the flash and a few more seconds for good luck) a few times.
I've been reading some posts about it not sending a signal to projectors and TVs properly. I think that may be it - it knows the external monitor is there, but isn't sending the external monitor enough signal to wake it up. Check your System Preferences -> Displays to see if it knows it's there.
Amy

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