Hi Spudskier
I used Naples Air Center (Florida) for my FAA Single Commercial and Instrument this summer and can't recommend them highly enough.
Next March will see me return to NAC for the Multi Engine Add-On, which I'm probably going to go Part 141 as I've never logged any multi engine flying in the past.
They're not the cheapest, nor the most expensive. Their Seminole is $175 per hour plus $35 per hour for instruction.
Bear in mind though that if you fly 10 hours in the Seminole you'll get a free hour at the end. Ie, for ever 10 hours you pay for you'll get 11 hours flying. This brings the aircraft cost down to $159.09 per hour.
Best wishes,
Charlie Zulu.