Audio and Security Questions

[66RedConvertible]

Hi! Glad to find this resource.
Two questions for you more experienced folks out there.

SECURITY QUESTION:
I'm restoring my 66 convertible and some jerk keeps stealing my right fender pony ornament. It's happened twice in 3 months. Although I'm tempted to wire my battery to the ornament bolts to shock the bugger next time he tries, I'm wondering if anyone can recommend a good security system that's 1) sensitive to even slight vibration and 2) whose installation won't ruin my car.

AUDIO QUESTION
Right now I have only a single speaker (mono) in my dash. Are the kickpanel speakers in the NPD/ Mustangs unlimited catalogues any good? I think they go for $129/ $125 per pair-- but is it better to get the kick panels with cut-outs for speakers and getting speakers separately? I don't have a bundle to spend, but I want to make a wise investment.
Any thoughts you have are VERY MUCH appreciated!
Thanks!