Keyless entry / starting

[aprisa]

Does anyone know of an aftermarket keyless entry and immobilising system as used by Mercedes and now others?
Before I start to drill holes for external locks and such like I wondered if I had the option of something that would set the car apart a little.
Cheers Nick

[Aprisa]

I don't want to ditch the door release or the lathches as these are moulded into the bodyshell and look fine, I just wanted to do away with separate keylocks which would be below the handles and to have a system that would remove the need to put a key in the column and just use a starter button whilst keeping an immobiliser function, any further ideas?
Nick