The CDIL BD139-25 and BD140-25 will have about 60% higher hFE than the -16 (original standard), and they are about 60% better then -10 (cheap ebay clones). And I think hFE will be important when used in audio.
I know there are some expensier voltage regulators for about $100, but the LM317 (negative) and LM317 (positive) are popular and used in many cirsuits - but be shure they are from known manufacturers, like Fairchild, ST Microelectronics etc, and not cheap china-clones.
For myself, I´m gonna use thermal compound for regulators and transistors heatsinks.
Best regards: Mikael Markstrom