Best security for a Jeep soft top?

I have a 2000 Wrangler that's been broken into several times. The last straw was when I went to get the air conditioning serviced and they told me the AC had been cut out completely! I can't afford to buy a full hard top right now. What else can I do?
Update: As per comments on the AC: The car was used but it did have working AC for the first year plus that I had it. I am not a mechanical expert by any means so I can't comment on the rest. Anyway, my priority right now is security so all suggestions are appreciated.
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