Auto trans, which did you use?

Hello, I have a perfectly fine 19k mile 518 trans that came with my 6.1, I was wondering what everybody has used for their swap?

I really wanted the TCI 6x, but not in my price range currently, so I am having to stick with either the stock 518 or go with a built 727 I also have. I have heard alot of problems with the 518, but the srt8 charger guys seem to love them up to 650rwhp.

The 727 will be stronger and better for acceleration and better for when I throw my ProCharger on the 6.1, but no overdrive will suck. So what is everybodies opinion.

Thanks.

EDIT: Also have a W5A580 trans in the garage.