Joe, any "A Body" GM 12-Bolt will work. Just double check the dimensions flange to flange to ensure you don't buy something too wide for your GTO.
If you're going for ultimate affordable strength, Moser makes a complete 12-bolt which comes all set to your specs for high teens to just at $2000 depending upon your optional choices.
You can also get a Ford 9" configured to bolt into the GM A-Body platform. The Ford 9" is slightly more HP hungry, but very strong. My favorite of this diff. is the ease of changing rear ratios. You could have one diff. with steep dragstrip gears and another with tall highway gears, and swap back and forth with little effort.
I guess these ideas are just another way of asking: How much do you want to sink into this?
Personally, unless my 455 was very wicked, I'd strengthen up the 10-Bolt, have a True-Trac professionally installed and go from there. You can install some goodies to beef up the 10-Bolt and it would be suitable for a mild 455. I think you could probably do this for under $650 if you find a shop with a reasonable rate.
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"I work in high speed aluminum tubing."
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