I found that the OEM Goodyears were particularly lacking in traction in dry / wet / snow. Dunlop A2 are a big step from the Goodyear Integrity tires - you will notice a big difference in grip, especially in wet weather, and ride is much quieter. Wear is going to be about the same.
As for picking a tire - it depends on what matters most to you. Ususally comparing the UTQG rating is useful for comparing similar tires can help narrow your search - then it is up to capabilities in dry, wet, snow, ice, combination weather, low noise, high wear resistance, lower rolling resistance, load rating, etc.
You mentioned corning - you could go up to a 16 inch wheel and stay the same width - but lower the aspect ratio. Lower profile usually nets you better corning at a cost to ride quality and road noise. But with the stock springs and stock sound deadening - most people can't tell. Remember that tire is a balance of giving and taking. If you want longer treadlife - you give up corning ability or heat resistance. If you want better summer performance - you give up winter capability. Not as bad now with better tread materials - but still some comprimises have to be made.
Try looking at www.Tirerack.com for ratings and fitments. This link to NHSTA has a good writeup on UTQG http://www.nhtsa.dot.gov/cars/testing/UTQG/Index.cfm.
That MPG gauge from JC Whitney - basically indicates the air to fuel ratio - the closer you are to 14.7 (ideal) the gasoline is burned most efficiently. Helpful with tuning the car (turbo project, etc.) but other-wise nothing earth shattering. You actually could cause more problems - since this splices in with your O2 sensor's wiring. I personally wouldn't get that - just something else to distract you while driving.
Good Luck.