As a former BB Addict, the email integration in my HTC Desire ( Gmail ) was still as not as cool as BB. The true push email was not available till i tested K-9 Mail

Try and see lor

http://www.androidtapp.com/k9-mail/ ( review  )

Home page - http://code.google.com/p/k9mail/

Enjoy Now we are as fast as a BB!!

P.S : In my HTC Desire , it does not suck up battery. I dont know for other Android enabled phones.