No widescreen modes available using dvi-vga adapter

I have a sony gdm-fw900 24" widescreen CRT monitor and just bought a new mac mini (1.66 dual core, 1GB etc). For some reason the mini does not detect that this is a widescreen monitor so all i get are standard 4:3 resolutions in the display system preference. I'm connecting through the standard white dvi-vga adapter that came with the mini.
Is there a way to enable other resolutions? I want to run it at 1920 x 1200
Thanks in advance,
Shay
Mac Mini 1.66 Dual Core Mac OS X (10.4.7)

Thanks for the expertise, its just that I'm buying a 26" Sony Bravia for my bedroom when I save up enough which will serve for my Mac Mini, (via vga), and for my PS3 (via HDMI when it is released). It would be ideal for the Bravia to have a DVI connection of that of a monitor, however I still think that VGA is a sound connection as I have seen in pictures off 123MacMini.com of users having connected that way.

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