interesting read, i am working on a similar project. i am using a hoperf rfm12b module ($6) instead of the bluesmirf and get decent results.
the comparison of the G2231 w/ the tiny24 is based on similar technical spec. i.e. pin count, memory size. but the tiny24 is not that popular, just google "attiny2313 projects" and "attiny24 projects" and u can see. a more real world comparison would be w/ the tiny2313 where most avr fans are using.
i would say the G2231 have my liking, mainly on being 16bit and inexpensive. and adopting the launchpad from avr development is effortless to me (gues