HD Toploader or TKO 500/600---What's your choice with a 460?

[Mustang Gregg]

I am still working feverishly on getting my '72 Mach1 on the road for a wedding in AZ.
I am to the point of getting a new transmission ordered. Most everything else (except paint) is taken care of or at least paid for. It has been 10 years of gathering & building.

I would like the opinions of you all on which tranny to choose. It will be one of these:
(1) TKO 500
(2) TKO 600
(3) Ford T&C 10-bolt toploader (original heavy duty type)
All have a similar warantee.

The car has a 425 HP 460 w/CJ heads. It weighs about 3800#. The axle is a 9" with 3.25:1 limited slip.

What would your choice be?

Thanks in advance,
Mustang Gregg