curiosity ?

Hi im going to try to keep this as blunt and as personal as I can but I own a family jewellers ive currently got a scantronic 9800 alarm panel which om looking to replace due to its age it's just your basic rkp endstation 2 sensors 2 door contact 3 shocks pa and 2 front and back caged bell box's I love diy so I will be performing this replacement myself and I'm after some alarm recommendations a friend mentioned a optima g4 but it's cheap price told me different, thanks