I have an Optio S4 and I love it. The only differences between it and the regular S are its 4MP, has a bigger memory buffer for rapid fire shooting, and a slightly reoworked menu system. If you have any specific questions, feel free to ask. 🙂
I don't have any experience with the Minolta to compare it, though.
To make your choice even more difficult, check out the Kyocera SL300R, I almost went for it over the Optio, but the place I bought it from wouldn't make a deal on the Kyocera like they did with the Optio. :evil: