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My brother has two SC's and I've spend hours and hours behind the wheel of each car. I've got an '84 3.2 and used to have an '86. One of my brother's SC's has a fresh 915 and the other has a very nice 915. My '84 has a fresh clutch, new bushings and fresh fluid. It shifts pretty well for a 915 with 95k on it.
It's been my impression that the harder you are driving, the easier the 915 goes into gear. It's a racing type transmission to some degree, so it would make sense that it would operate easier under more stress. My brother's car with the fresh 915, new clutch (as well) and a factory short shift all set up by a master mechanic shifts exceptionally well. It's a hoot to drive that car with that perfect transmission. It's no Honda tranny, but it's good for an old school type transmission.
I would also assume that your '79 is a bit lighter than a late 3.2 car would be, so, while the increase in power will be noticeable if you moved from the '79 to an '88 for example, it won't be a huge increase that you would feel if you went to a 964/993.
If your car is in good working order and you like it (condition, colors, options), try to get that transmission in proper order. The move up to the G-50, while a nice upgrade, may not be worth giving up your car that you are comfortable with and know very well.
The late 3.2's are very nice cars. It all depends on what you find for sale and what you can live with for trade up costs and then repairs on the new car (they all need something!).
I gave away my '86 911 to 'upgrade' to a 964. I ended up having to get another 915 equipped car because I missed the involvement of the older car.
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