Arduino Mini Pro 5V/16MHz is identical to Diecimilia and Duemilanove 168. Sounds like you're doing the right thing there. Don't choose the low-voltage / low-speed variants from the board menu.
Also, you say you're using the blue Italian breakout, but if you're using the red SparkFun FTDI breakout, you will have to adapt it to provide a full 5VDC to the chip, as it normally assumes you have a 3.3V board. See the photo I added to this thread.