I would't buy the 1199 unless you find and EXTREMELY good deal on one since it is now an obsolete product.
Humminbird reduced the price of the 10" units radically when they released the Helix series.....They have Autochart Live built in, faster processor, much brighter screen with higher pixel density, they have a fix for the data box problem ... and they are the current series that will be updated with new features first and for a couple years longer than the 99 series. Better yet go with a Helix 12 and get chirp on the standard transducer.
There is a software release coming out soon that will give support for Smartstrike on the Helix series ..... This and other things may never make it to the 99 series.
who knows what the future updates will be ..... Humminbird just added chirp functionality with the Onix series that will work with the standard transducer without using an SM3000 module.