I recently switched from Lowrance to Garmin, and could not be happier. But the fact is that each of the three major players in his market produce quality instruments, only limited often by our inability to comprehend their capability. Everyone will tell you to get as large a screen as you can afford. Don't spend your stupid! Look at used units that are offered on this forum. The knowledge you have of your Texas lake, coupled with decent electronics, will ensure many happy hours of fishing for you. BTW, my unit is the Echomap Plus 7SV. It is capable of everything I need.