I work with a LOT of criminals, and I've had conversations with them about why they chose certain places to rob over others. They all say roughly the same things:
#1 - Low light, or no light and lots of shadows and/or concealing bushes or trees.
#2 - Obviously unconcerned neighbors (they can loiter around and no one says anything to them).
#3 - No obvious signs of a security system (the kind that notifies authorities).
#4 - No dogs.
#5 - Visible goodies through windows or in the yard (unavoidable if they stake you out and use binoculars whenever you open a door or window).
What I'd suggest is immediately
trim back any bushes or trees to open sight-lines to the road if you can. Remove anything you can that offers concealment. Privacy fences give you privacy from your neighbors, but they also allow a criminal all the shielding he needs to break into your house unobserved. Criminals LOVE privacy fences!
Replace your porch light(s) with a motion sensor dual-head flood light. You can find them at wal-mart for less than $20 for the cheapies
to $40 for some nicer looking
ones, and they're super
simple to install as long as you remember to turn off the breaker
Go on Amazon or E-bay and buy some REAL security company stickers. You can usually find them relatively cheap. You want a real companies stickers so if a would-be crook calls the number on the sticker, a real company answers. If you really had a security system, the company would sticker every window, so do the same. Look for Monitronics
or ADT stickers or some other company that's actually in business (Brinks is NOT anymore). If you want to add another level, find an old keypad for whatever company matches your stickers and screw it to the wall near the door like a real one and attach one of those door jamb squeelers
to your door, they have them at wal-mart for $10-ish bucks each or on e-bay too. If you want to go all-out, you can get one of those fake TV lights
Remember that criminals are NOT stupid, they're just people with less morals than you or I. If the sticker looks fake, or the camera is chintzy, they'll know they are bogus. If you get fake security, make darn sure it looks as legit as you possible can...and NEVER tell ANYONE your dirty little secret! A substantial amount of burglars started out by robbing their friends and family.
If you get 2 decent lights, some door/window squeelers, and 10 stickers you would likely deter most amateur thieves all for about $50 to $75. Look at it this way, if $75 saves you replacing all of your stuff, it's a cheap price to pay...even if it means living off ramen for a while!