6131. Talk about making you appreciate S60, lol.
Seriously, though, for calls and texting, you can pick one up for REAL cheap, it's got the frills (music player, a2dp, etc) to use if you want some of the features of the n95 with the toss-a-bility factor high.
S40 has come a long way, but it'll def make you appreciate S60 even MORE.
If not that, then I agree with the E50. Personally, i wouldn't spend more than $2-250 on a backup, since it's going to get beatup and probably not have a high resale afterwards anyways