Speed rating on a Camry? T or S is just fine. Besides, it's longer tread life. A Camry isn't exactly a vehicle you're going to go high speeds for extended periods of time anyway.
I just got a set of Michelin X-Ones in that exact size very cheap (X-Ones are not made anymore. The places that still have them in stock are pricing them cheap to get rid of them). Although that tread design I do not believe to be the greatest for severe weather (meaning snow, mostly... for rain it should be just fine). My mom has a set of Michelin Weatherwise (195/60R15) on her 626 and the car performs excellently in the snow.
As a tire technician, I am not a fan of the flex Michelin puts into their sidewalls just because when it's a tight fit on the rim, they are a pain to dismount. But on the other hand, once it's on your vehicle, they are very nice to have. The sidewall is still stiff and provides great structual rigidity, but the flex they put in at the certain part of the sidewall (towards the top... almost where the sidewall meets the tread) makes for a nice ride while maintaining good-handling characteristics. I am a fan of having Michelins on vehicles for this reason. They are very good tires.
HydroEdges are great in the rain, but I am unsure of their snow capabilities. It all depends on what kind of severe weather you're talking about, I guess.