Should I consider buying or move on?

I like the 2007 Honda Odyssey ex-l. I test drove one recently that's at a good price and miles. The only problem is that the steering wheel shakes above 50mph and continues while at 70 to 75mph. Should this be an automatic deal breaker or should I consider buying and bring to mechanic to inspect? I hate to waste money for multiple mechanic inspections.

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