I have roughly the same set-up. Most days are nice around here, so I don' t commute on the rain bike/backup bike/grocery bike much.

Neither bike is very expensive. The backup bike is a "barn find" $12 bike ... a never-ridden 1987 mid-level Schwinn from a thrift store. It was my daily driver for several years, though.

I am a big believer in a two-bike plan for commuters, but for many folks the biggest hassle will be storage of two bikes.

-Hub
t: HubSpanner