Best cities for medium/high end 4-plexes

[Andrew McCormick]

I live in the SF bay area, where I work as an engineer. I have a strong income, so financing should be easy.

I have ~10 years experience in real estate, but the market near me is terrible for cash flow. I'm looking to invest in some 4-plexes (so that I can get residential financing). I'd like to hear some suggestions as to cities anywhere in the US that have reasonably nice/safe areas with good 4-plex deals.

Preferably: 

a) at least 50k per unit, 100k+ per unit would be ideal 

b) GRM of no more than 8

c) Big enough market that is the first few go well I can buy many more.

My ideal would be something like a 400k 4-plex in a medium size city that rents for 1200+ per unit. 

Suggestions?