So I have an SE Lager 2009 and it came with Kenda K176 700 X 28c tires.

If I were to get new tires, could I switch to 700 x 23c, or should I just stick with 28c? I just ride my bike to and from school/work.

Also, what are some good, affordable tires?

I'm look at these 3 right now:

Michelin City Mountain Bike Tire with Protek
http://www.amazon.com/Michelin-Prote...0777434&sr=1-5

Michelin Dynamic Road Tire
http://www.amazon.com/Michelin-Dynam...0777652&sr=1-2

Continental Ultra Sport Bicycle Tire
http://www.amazon.com/Continental-Ul...0777617&sr=1-6