I alternate between just an old-fashioned phone ringing (any one you download will be different from the crappy synth versions most phones come with). and the 24/CTU/Jack Bauer ring tone. Both of them sound like normal rings that fly professionally, but are distinct from the prepackaged stuff most people use--I'll switch from one to the other if someone has something too close (less common with 24 now than when it was airing). The 24 one can get some smiles, but to people who don't know it it's just a somewhat different cell phone ring.
I use the old Macintosh "Wild Eep" alert sound for texts; it's short and distinct, and was mainstream in computing noises for a decade. But it still may be a little silly for your needs.
