Ok a few things that need to be addressed so you understand how sizing of rims and tires works.
The first number is the width of the tire in mm.
The second number is a percentage of the first. So if your tire is 195mm wide, and you're using a 55 profile, in theory, the tire should be 107.25mm tall (from the bead).
So if you wanted to go with a 16" rim, you'd use a 205/45, where the tire would be 92.25mm tall. The sidewall would need to be shorter on the 16" rim to compensate for the extra inch of rim diameter to keep the same overall approximate size.
Obviously the third number is rim diameter.
Now with rims it's a bit more complicated because offset comes into play. We just ran into this with my brothers ES300. I have a set of 17x7.5", 38mm offset rims that we were going to install. Factory rims on his car, I believe, are 16x6.5" with a 45mm offset.
The way offset works is the lower the number, the further the outside of the rim, (the part where the tire actually is mounted to) moves towards the fender or outside of the car. The higher, the more the outside of the rim moves towards the strut.
However, the width of the rim also plays a role here.
If you're going to use a rim that's wider than the factory rim, you can use a slightly higher offset to move the outer portion of the rim towards the strut so it doesn't rub on the fender and doesn't require rolling the fender lip. However, if they're too wide, they'll rub on the strut, which is the problem that we ran into with my brothers lexus.
So he had to buy a new set of rims that were 17x7 with a 35mm offset, however, because the rim was 1/2" narrower, it fit properly.
At any rate, picking wheels is subjective to the person. I personally don't like chrome on white. I think it just looks odd. But that's just me. I don't particularly care for black rims either.
However, I think silver rims are tasteful.
I found this set
on tirerack, and they're reasonably priced.
They're 16", but they wont rub because of the offset.