Help with alpine navigation..pls

[94LS 10+ year member]

I'm looking for an alpine navigation system to add to my dvd player/monitor. Anyhow I was looking around and have come across the nve-n852a and nve-n871a add on navigations and wanted to know which was the newer unit and which was the better unit. I know the nve-n872a is the newest but that's WAY out of my price range and other two units seem so be attainable a lot cheaper. Anyhow the nve-n852a seems to look like the newer model but I'm not sure. I would really appreciate the help of the guru's on here. Thanks.

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