I agree with the previous post about that magic 100hrs of multi. I am a CFII with 750TT and I have 72hrs multi. Since I don't have my MEI, I usually split time with friends of mine flying a beech duchess for $150 an hour. I have been doing about an hour a week for $75 for the last 8 months and I will continue to do this until I hit my magical 100 by summertime.
I would recommend this if you have the ability.
As far as corportate VS. regional, my advice would be regional.