Even though I hate mobile phones as a principle, I have two and wouldn't leave the house without one!
My personal one is a Sony Ericsson K800i, (I think!) and my work one is a really crappy Siemens C65, (I think). I did have it upgraded to a C75, (Same phone, different box!), but it doesn't fit in my car kit!!
Oh that's something I have multiples of!! I have two functioning and constantly used car kits in my car! One is a Bluetooth for my Sony which is great 'cos it does stuff like voice dial and address book interogation, and the Siemens one which is wired through the cars ICE.
I still have a load of old phones in a drawer, now redundant spares due to upgrades, K750i, K700i, T610.
I did originally order an M600i on my last upgrade and while I liked the look and feel of it, it wouldn't sync' properly with my car kit, didn't have a camera and ultimately, it switched off and wouldn't switch back on again, so it went back.