At the risk of sounding like a broken record... I recommend the (nominally) 1/72 Italeri range of buildings, in particular the Country House with Porch and and the massive Church. The Country house has nicely thick walls, a well sculpted pantiled roof and really looks the biz. It also works well with 28mm figures and conversion potential is great. I even bought up a couple of the plain Country House models (which are somewhat less useful for Spain or Latin America) just to use as a source of parts. Cheap as chips.
The church is a really impressive bit of kit. Mine's still in the box and it will get a roof swap and probably a little plastering at some point but by god it's big. No way I would afford something like this from one of the dedicated resin manufacturers.