Phone Upgrade Time

[Blackstar]

It's that time again for me. As I'm on a friends and family contract I have no other options open to me other than a new phone, i.e. I can't get a reduced price or extras added.
I currently have a SE K850i which has survived 18 months now only needing to be sent away for repairs once when it broke terminally, which apparently is very good for that phone.
Now I need to choose a new phone I'm a bit stuck, my main criteria is that it needs to be almost bomb-proof. As my current phone can show, I'm very clumsy, it has many war wounds to show for its adventures from great heights and along paths.
My choices are somewhat limited by the semi-indestructible requirement.
Options....
T-Mobile G1 (google phone)
+ Would be interesting.
- I'm not entirely sure I would ever use one of these properly, I rarely use my phone as it is. Also I would be a little worried about how fragile it might be.

Nokia 5800
+ Lots of useful features, reliable brand
- Just how strong are touch screens? I'm not interested in using it as a music player

Sony Ericsson c905
+ Slide keypad so lockable, good camera, sturdy
- SE seems to be prone to faults that I only find out about after I get the phone, I'm not interested in using it as a music player

Help.