Mailman; We both have the same 453. Orange & white.
Alright, I'll share some of my experiences then.
The stock Contis are Loud. The loudness varies on the type of pavement you are driving on but generally when you are above 40-45mph you hear the tires and not the engine

I took them off and found replacement tires and wheels.
The 453 changed from the original Smart 3 lug (3x112) used on the 450, 451, and 452 to a 4 lug (4x100) wheel.
Most 'smart car' wheels you see are are 3 lug, and most 453s are rolling on OEM 15 or 16" wheels (ie. you don't see many for sale).
When you posted "It has low profile tires and want to replace with regular tires."
Well, what's a 'regular' tire to you - I guess NOT low profile.

You would need to go to a smaller rim - 15" to not be low profile.
The other thing I ran into with the stock 16" rims is that front tire size (185/50/16) sucks.
Only the noisy stock Conti and the squishy sidewall Vredesteins exist.
You have to go to a different tire size to get a good selection of decent tires.
So when you say you want to replace the stock 'low profile' tires 'with regular tires', is this what you are after (ie. a 'regular' size tire)?
If so, look at the 195/45/16 size.
If 'regular tires', to you means NOT 'low profile' tires, you have to get a set of 15" rims.