After many of years denial, I am gonna get myself an Cosworth. Although I have friends that have these cars I am looking to get as much advice as I can. I have a reputation of buying lemons and I wish to squash them

( like my little joke!!! No, I will carry on then!). The only spec's I am really after is 2wd and a few after market mods. I am also prefering a lower mileage car but I know these cars are used alot everyday. I am also undecieded about a 3 Door or a sapph. What are the differances between them?.
Hope you guy's can help