Couple newb vista rino ?

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Hey guys I've looked through a few things and it looks like Vista and Topo 5 don't get along too well, I haven't searched the 6 forum yet, but is there any great Vista advantage with topo 6,

Also I'm thinking of buying a Rino 530 and I've seen where people are downloading maps to them.

Any specific comments on getting Topo 5 to work with the rino or tricks on getting topo's into it

if not I may buy the Garmin software, I hate to buy 2 softwares that do the same thing