Not sure about the brands you say you think you have. Many times with false triggering it is actually the car itself. Most of the time it is a faulty door pin switch or even something electrical where there is a big voltage difference.
To recomend an alarm, just about anything from DEI is a safe bet. Remember that usually a $200 alarm protects just like a $500 alarm. It's all the extras you add to the system that makes it good.