Is there a way to play a tone (ringtone, whatever) when I get an SMS message.

If this is possible, is it also possible to play a tone (possibly different) when I get a SMS from someone I actually care about (possibly by designating a special tone in their contact listing)?

Finally, is there a way to see a notification of a waiting SMS message on the Nokia N9 black and white lock screen. I'm sorry, I forget what it's called. It comes up when my phone has been sitting idle for a bit.