Garmin 430 with a 106 CDI can replace the KY196 and KX155 , . and you get GPS moving map thrown in. they also make a transponder. If you go with an all garmin panel ( including audio) they give you an extra discount.
On second question I have heard em called turn and bank and turn and slip indicators not sure if they are the same some helicopters require them for night vfr ( EC130 anyway ).