The C600 is good, unless your trying to install satnav, then good luck. otherwise i have had mine for over 12 months and its not bad, camera is a little poor, but for phone use and bubble breaker, great!
good battery power and good talk time, imo.
But i think the phone is at least 2 years old so would only recomend it as a back up not as a main phone any more. the M3100 looks good, but be warned, orange will try and get £150 out of you unless you go 18 month with them and then its only £4.99 lol....
If you cant wait till March, the N95 looks great!
ColiN