Supple, I'm not sure about LoJack, but I do know that VIN etching will generally save you 10-15%. Every car I've ever had LoJack in came with it, so I can't give you an installation price.
What I can tell you is to do a few things that you may or may not already be doing. First, if you're shopping online, you may want to call some independent agents. You can find a bunch here:
http://www.iiaba.net/na/default?Cont...&ActiveState=0
You can't deal directly with most insurance companies, so getting an agent involved should increase the number of quotes you're getting. You should also contact the "captive" agents, like State Farm, Allstate, Farmers, etc.
One thing that you can use to bring down your auto premium is to insure other things like your home/apartment. If you're renting, there's something called Renters Coverage, which is really good to have if you're living in a place with shared walls. You know you'll be responsible, but you don't know if the folks next door have ever cleaned the grease off their stove or not.
You can also play with deductibles.
I think that the most effective way to lower the price, though, is to play with the coverages. If this is a salvaged car, you probably don't want or need to insure the physical damage. There are two parts of physical damage, comprehensive and collission. Collision covers your car if you hit something (or someone), and comprehensive covers everything else (like theft, floods, trees falling, etc.). If you decide you need to insure the physical damage, maybe you should only cover the comp, since that's what you seem most concerned about.
One last thing - you should buy the highest liability limits you can afford.
Let me know if you need advice or interpretation of any terms or anything like that. I do commercial liability insurance for a living, so I'm fairly well versed in most of it. If there's something I don't know, I can find someone who does pretty easily.