As my profile suggests, I am new here with my recently purchased 190E 2.3. I found tons of great info in the 201 section, that I used to make an informed decision when buying my car.
Head to the 201 section and look for the Frequently Asked Question sticky at the top and go through the links to get a good idea of common problems and fixes.
As for the car you are looking at, you will need to find out more info if you want some opinions.
What 190 is it? 2.3, 2.6, cosworth?
How many miles? Does it have any service records? Any history?
Without this info, its hard to make a judgement, but the price seems high for a 190E with front end damage.
I say this because most 20+ year old cars need stuff!! Rubber might be degrading, timing chain could have issues, suspension parts getting old, oil leaks are common.
I would ask the seller as many questions as he can stand. If he gives you the "Its only a $1500 car" attitude, I would walk away. Nothing wrong with finding out everything you can before giving someone your hard earned money.
I would plan more money than the asking price and the radiator/grill/fan.
(Just as an example, I paid $1400 and another $1600 in parts/labor to bring it up to date). You can find what I had to get done and the cost here(scroll to bottom):