Baby Monitor

Susan
Hello y'all! I'm a first time momma-to-be, and all the baby product choices out there can be overwhelming! Especially baby monitors. 
Which will keep hackers away? Which has good service/connection? Do I need one that is compatible with my iPhone? Am I overpaying for a brand name?
HELP! 
What has been your favorite video monitor, or which are you planning on buying, and why?
Thanks for your advice!