Hi, I am looking for advice on upgrading my tires and possibly rims. pros and cons of going with 20 inch and optimal tire width.

I'll list all cons I can think of, most of these are obvious but just in case.
Cons
-lower fuel milage
-rubber is more expensive
-rims are heavier and more expensive
-possibly more road noise (depending on rubber)
-wider front tire may pull to one direction increasing wear
Pros
-looks nicer (fills the wheel well)
-more grip (safer)

Another con with 20" wheels is the tires have almost no sidewall. You will feel the bumps/road imperfections way more than you do with a smaller wheel.

I would agree, 19" or even smaller (if they can fit over front brakes) would be more daily-friendly.