Transfering contacts t730 to Nextel i530. Help!

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I carry two phones. Nextel i530 for walkie-talkie (and I look forward to
the day when Verizon is competitive); Verizon t730. I use iSync to keep
the t730 contacts up-to-date from my G-5 Mac, and couldn't live without
it.

I need a way to transfer contacts (address book) from EITHER:

t730 (or my Mac G-5 address book) to i530.

I do have a PC available in addition to the Mac.

I don't want to type them in one-by-one. I have USB data cables for
both phones. I don't mind buying software, or going through several
steps to accomplish this.

TIA

John