The game I am designing will be based around 1 or more cities/towns, think GTA Vice City, Shenmue etc. I want it to look realistic, as the gameplay will reflect realism in quite a big way, so it can't be as styalised (f**k knows how to spell that!) as GTA. Influences are Gotham City from Batman movies, Manhunt, etc - fairly dark and almost gothic in most places, industrial areas etc but some posh/nice areas. I'm trying to find some decent pictures - looking at photogrpahy/architecure books on Amazon doesn't really find what I want though. Can anyone suggest any websites, boks etc??? Or any games with this style of level design that I haven't thought of.

I'm not sure if it's what you're looking for, but City Designer by ProFantasy software allows you to create detailed cities (please note that you also would need to buy Campaign Cartographer 2). Hope that helps.