Siemens C35 - loved it, but I was too fast with the first time use, so I destroyed the battery
Siemens M55 - "tough" hah, but it had LED lights
Siemens M75 - this one was a tough phone, for a while, then the removable parts started to fall off
Nokia 6121 Classic - nothing to say, it worked for long time, probably still works
Nokia 6210 Navigator - this one is still kicking, after more than 5 years of heavy use
Samsung I5700 Galaxy Spica - painfully slow and half assed attempt to make an Android phone, there is some little hope that it will get CM7
Samsung I9300 Galaxy SIII - perfect