Well if you think the Sidekick is good Email pager ... then good luck. It has a battery life of 2.5 days. You know what that means ... lucky to get a day out of it. Like the last one you had to carry several battery to last a day with the Sidekick 1.
My Blackberry last for a week or more. I have to say I do not use the phone part but very heavy email all day long.
Besides I do not think Sidekick is Push email ... I could be wrong but I think the fist was that way.