to add to what Cliff commented on ...

make sure you have steel entrance doors with quality deadbolts and reinforced striker plates...vision peep holes

combination of motion sensor lighting with continuous yard light (I get a couple of years out of a compact fluorescent)

wireless alarm and video monitoring systems are reasonable...even without a monitoring service

curbside house numbers in addition to visible house numbers for EMS

good neighbors are a bonus

and if your gun safe is running out of room... pre drill a hole near your doors for a 16D nail with the head removed...slip a piece of rubber tubing over the nail..slide on an archaic revolver thingie's barrel you don't shoot any more (Security Six and .44 Charter)....

remember you don't have to open the door just because somebody knocks on it...