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CWI_Tech_Guy - 9:00 am on Jan 7, 2009 (gmt 0)
Melbourne IT is a big registrar and is likely to be assimilated by another bigger registrar before it goes under.
In short yes, you can have these separate relationships with your registrar and host. At any given time, if you are switching hosting, you can simply contact them and request that they change your nameservers.