the firewire cord is universal as far as i know. you can get them cheap on ebay. just make sure ur computer has the firewire port, its not a standard port
unless you buy a used cam, you will need a high def cam nowadays to get good low light. for under $1000 (excluding accessories) you will have to do some price hunting but id go for the panasonic...
both will have the rolling shutter, its unavoidable. but the sanyo only has electronic stabilization, where the pana has optical. if ur looking for a steady cam, avoid the sanyos