The kinds of modifications you are looking at are expensive. A new car might be cheaper. Your car may have 16" wheels with 205/55-16 tires unless you have the SR or SL. They have 17" wheels with 205/50-17 tires.
From reviews on tirerack.com, there are clearly preferences for tire ride and comfort from different models of tires. If you go to tirerack.com, you can look up your car and see whick tires have the highest ratings in comfort. BTW, two of the highest rated tires also are rated for mild snow conditions. They are not rated for winter in an area that gets lots of snow or ice, but for occasional snow or ice where having separate winter tires is not economical. Lots of information on that site.
Your vehicle has struts instead of shocks and you can expect them to cost $4-600 each installed, maybe more. You could do two at a time to spread the cost out. KYB struts are pretty good at providing a smooth ride. I would recommend the KYB strut+assembly because it includes everything (including new springs) already assembled and an honest mechanic will charge less for the labor because it saves him a lot of time.
Anything beyond this and it really is not economical to do. As for the bumper, see this: