ptptpt1:
The meter speed on the 79 TM and 75 BH scares me...
They're pretty fast. That's where a more expensive ball can make a difference. Those fast-meter irons (L79 and then L90) are the best irons until L97. The L90 are the same 3.0 meter speed. Some opt for the L85 irons because of the slower meter speed, but I don't believe they are quite as good. Of course, if you can't handle the meter speed, the L90s won't be better for you :)
I used the L48 ball for a while but recently switched to the L61. My biggest problem is being very early on my D, 3W, and wedges as they all have 3.5 meter speed.