Amalric - I followed the link
A film I shall watch out for!!!
Legionaire - I like the mdf buildings. They look really good but I have about 20 foamboard ones now and I'm not sure how well they would mix. I plan on doing a very british civil war game at some point and I think I will be using mdf buildings for that.
Me personally, because I have limited storage space.would look into multipurpose buildings. Although my ATZ campaign will take place in the UK, where WWII buildings will come in handy, I will opt for sarissa's City block, as I can use it for modern/ superhero too.
I can't judge how well paper/ MDF will mix but personally I'm not too bothered. Suspension of disbelief you know!!! I've even comfortably used my daughters Brio train set q couple of times.