You are using the Xorg vesa driver (which is limited to just vesa resolutions), likely because the radeon driver in OpenBSD 5.1 isn't new enough to support your GPU. You can try specifying the radeon driver in your xorg.conf file (@line 60) but I have a feeling X will fail to start.
You can try updating to a newer version of xf86-video-ati. Theoretically you should at least be able to get basic modesetting working, giving you 1440x900, but you won't have any 2D or 3D acceleration.
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