Which one is a good stud and cable finder under £75?

I have found this one: http://www.screwfix.com/app/sfd/cat/...57327&ts=47417

However, if possible, I would like one able to locate metal and live wires up to 1.5 inches deep, the one above is only 0.75 inches.



Even after carefully selecting a spot far enough from a mains socket, I hit two phone cables which required a lot of work to fix.

Will phone cables be detected?

Thanks,

Antonio