Bumping
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Second, use the search tool. There are lots of threads out there about these subjects.
If you are comfortable with your Blackberry skills, go the .83 route...i.e. read the threads about where to download it, how to back up your contacts and where/how to get/use JL_Cmdr.
If you aren't comfortable with your skilss, do the OTA to .75 and wait out.
.83 will be official eventually. If I remember, the .75 leak came out only a few days before the official VZW version.