This is what you wanna get:
406 Mastering Audio Tape 1" x 2500'
Plenty of hit records made on the 406.
I've used both 456 and 406 and, really, the differences are negligible, especially when you stay at reasonable levels. The 406 sounds better IMO, more natural, especially when pushed. You don't have to change anything on your recorder to use it. Use in place of 456.