I have an A80, I love it! It is a great camera. The swivel LCD is very convenient, I don't think I could live without one now! The LCD is just to make sure the picture came out the way you want it anway, not to view you pictures all the time. That's what you computer is for
If you get the Powerex 2200mAh NiMH rechargeable batteries for it, you will be set!! They last forever. I have three sets for mine and I have never run out on a bping trip.
I dropped my camera down a 60' cliff and it landed in a pile of rocks, the lens was open, and the LCD was open. It still works perfectly! I seriously recommend the A80. The digital zoom works pretty good too. Better than some others I have seen, plus it will work better with a higher megapixel.
I don't know if the A75 has the full manual mode or not, but that's the only mode I really use, other than the panorama mode. I love to be able to set my pictures up the way I want them. The A80 is definitely a versatile camera for the money!
Hoipe this helps!