upgrading exchange 5.5 to 2000 with AD

[qwestdex]

i was wondering if this was the ideal way of going about that. currently we have win2k with AD as our PDC and another win2k box with exchange 5.5. no replication or connection agreements anywhere. Should i setup the win2k box with exchange as a BDC with ADC and upgrade from 5.5 to 2000 on that box too? then set up a connection agreement to each other while having a two way trust with the PDC and BDC? basically i want to have a backup set up DC set up as well as upgrade from 5.5 with connection agreements and replication.

thanks