Advice on Insulation quote

Hello All!

Thank you in advance for your knowledge as I myself have none.

Long story short, we got a quote from an insulation company to blow in an extra R30 on top of the existing R20 that we have in the attic.

When they came for the inspection they noted that the original install of the insulation in the 70's when the house was built did not put in a vapor barrier and all the soffit vents were blocked.

Now they gave me 2 options.

For 1.6k they will fix the soffit vents and blow in the additional R30 to get us to R50.

For 6k they will remove all of the existing insulation, spray foam for a vapor barrier and then blow in the full R50.

Note: There is no mold or anything growing in the attic without the vapor barrier.

In your opinion would the full spray foam treatment be necessary?