I like them all, but not number 2, but maybe that one will work for your taste- it's just not mine. I really like 3 and 4 (the one your husband likes).

I am doing a kitchen remodel which will increase our kitchen size (going from galley style to a U-shape with an island. Proposed layout from the cabinet builder is attached (I penciled in the bar top and I put circles where the cans approximately will fall). The island is sized to be 64" x 83" -- a prep sink in one corner and seating (15" knee spacing) on opposite sides of the sink. This puts the bar top off center of the bases. My wife has a preference of a particular 6" pendant. My questions are: 1) Do I install 2 or 3 pendants? (two looks too far apart for the 6" pendants -- three looks too close together at times to me) 2) Do I put the pendants on center of the bar top or on center of the base? Center of the base will put the pendants on the kitchen/food prep side, but I worry about symmetry. Your thoughts and recommendations are appreciated! If you need additional information or have thoughts outside of the two questions, I would appreciate them! Thank you!

What's the rest of your lighting plan like? Recessed ceiling lights? I'm asking if the pendant lights are needed for the function of your island, or whether they are going to be there to make more of a visual statement. check out How to Light a Kitchen Island from YLighting Their products are all very modern, but just read for the principles.

yes your math is good those fixture will not give good working light, too bright will be right in your eyes, to dull will not light the surface, be sure you have good placement on the recessed.