IMac 27" & External monitor ( Benq 241 ) resolution problems

Hi, im using a 27" imac... recently just bought a mini displayport to HDMI cable to hook it up to my 24" Benq 241 monitor.
Im pretty sure ive used this monitor before without a problem on my old macbook.
The monitors max resolution is : 1920 x 1200
but im only getting the option of :
1080i
1080p
720p
480i
480p
1600 x 900
1344 x 1008
.... the rest go down in numbers
selecting 1080p gives a fuzzy picture... and 1080i, is what looks liek the highest - but still really pixellated
any ideas?

You can get one like this
http://store.apple.com/us/product/H1824ZM/A/Moshi_Mini_DisplayPort_to_HDMI_Adapt er?fnode=MTY1NDA3Ng
But you can also get an inexpensive one from Monoprice
http://www.monoprice.com/products/subdepartment.asp?c_id=104&cp_id=10428
They usually work well

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