Affordable 5 or 6 speed transmissions?

I just put my motor and trans back into my car, only to find out it will not shift into 3rd/4th while sitting in the garage( havnt tried shifting while driving but doesnt sound like a good idea) I am thinking that since i have not yet ordered the 4 speed tunnel and i would like to drive this thing on the highway with my 3.91s, I should maybe consider a 5 or 6 speed swap. I know t56s are pretty pricey but lets hear some numbers for the conversion!