Although Mercedes-Benz 190 make a great choice for a modern classics, they've still got a lot of ground to make up when it comes to prices. As such, projects can be had for as little as £500 while on-the-road examples in need of TLC tend to go for about £1250 - £1750. Head over to a dealer and you'll be paying £3000+ for the best examples. Have a look at some vehicles similar to yours and get some quotes in for the work you need. You might find that you'd be better off trying to sell it as it is - or you might find that investing some money in it now could pay dividends when the time comes to sell.