Ventilation Question

I have an 89 Excella that I am renovating and have to replace both fans/vents on the ends. The ones there are original, don't work and one is leaking. I am one that likes to keep things simple so I thought about replacing one with a manual vent and the other with an fantastic fan with just speed adjustments. Any recommendations would be appreciated.

Thanks



My kid Sam says I need a smiley face..here ya go. :D