Best Central locking / alarm system


Hi guys I bought a Central locking / alarm system off eBay a little white back and tried everything to get this bloody thing working. The alarm worked and the central locking did some strange things but just didn’t work how it was supposed to.

Has any one got any advise on a good unit to buy and fit in a Fiat Marea
The main thin I want is the remote central locking but a alarm would be nice also ( but not a necessity )
And im really not sure about wiring anything into my ignition.
My local road radio store sells the remote locking units by Gemini any one had any good experience with these working.

Thanks for your help again.