for those types of phones it goes like this:
1) blackberry
2) SK2
3) treo
sure the treo has a lot of bells and whistles, but like mark said, it has a lot of problems (everyone i've talked to with one complains about constant crashes, rebooting, etc.). the SK2 may not have the most up-to-date features or phone (not the best call quality), but its email/AIM/web browser capabilities and multi-tasking abilities make it a great device overall. get the kick