What kind of skateboard trucks should I get for a bowl/park set up?

[Booneypants]

I'm usually a street skater and I skate low trucks, usually grind king, tensor, or I wanna try thunder next.

But I'm looking to set up a board for bowl. (8 inch deck)
I was thinking mid-size trucks: Independent (duralights)? Destructo? Royal?

What size hanger would be good for an 8 inch deck? Independant comes in these sizes: 129 (5.0), 139, 169. It looks like the standard size for most trucks is the 129 (5.0). for an 8 inch deck should I go 139?

Thanks for your help.