I purchased a used Lionel 180W Powerhouse brick on the "bay" at a nice price and can report (as others have) that using a 180W brick is a viable option for driving a NCE 10 amp DCC booster. I like that the Lionel brick is internally protected and is quiet (no fan). As previously posted I protect the output (track) side of my boosters with DCC Specialties fast acting/auto resetting PowerShield digital breakers.
Brendon - I adjust the output (DCC voltage) of my 4 NCE PB110a's to the same voltage (I use 15.6v ) so that there are minimal differences at the gaps between power districts. When I replaced the noisy fan cooled switching power supply with the Lionel brick I didn't make any voltage adjustments at the booster.
If I were to add a 5th booster I'd also consider the power supply Thor mentioned (under $80). Thanks all for your input.