I am shopping for a WC T5 as well. Funny, there everywhere when your not looking, but as soon as you need one they are scarce. I plan to match it up to a 454, so I want a decent torque rated world class one.

Look at a Tremec 3650 (from a newer mustang), they are pretty cheap and have more forward shifter. The tremec 3550 is even better but more pricey.