new cctv installation hi def sony 1500' underground fiber

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new cctv camera project sony hi def camera 1500' fiber

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This is project that i have started,i have the ptz dome sony fcb eh 6300 hi def camera with sdi hd output,i have a few questions,what type fiber should i use?single or multi ,looking for a sdi hd transmitter and reciever with rs 485 ptz control and two sdi inputs,witch one should i use?the $400.00 or the $3000.00 one,will be using about 100'coax to transmitter at camera end,and 25' coax at monitor end.any ideas would be appreciated thanks Lee