Can anybody recommend one that I can install? Is it really necessary to pay a fee for monitoring or can I just depend on it to call my cell and/or trip a loud alarm if there is a break in? Amazon has a large selection. http://www.amazon.com/s/ref=nb_sb_ss_i_3_7?url=search-alias=tools&field-keywords=home alarm systems do it yourself&sprefix=home al,tools,262