Well it might seem there is a scissor/tool for every occasion.
I loved my pair of Wave Scissors, they were my favorite all purpose. Foreground, midground and background plants easily. The longer the better, 12 inch Ebiken are great for the price.
I want to try a 12 inch spring curved scissor next though, and will pick one up in the future probably.
Pinsettes are a little more tricky, I would do a grip tip and a fine tip straight pair. This allows for small roots and delicate plants and more robust plants. (The longer the better I find 10-12inch)
So my basic starter kit would be:
Fine Tip Pinsette
Grip Tip Pinsette