Look around for a switch mode power supply. They're much lighter, run cooler and come in fairly small units. One to power the 156W will be easy to find as 13.8V psus are used for radio equipment so are fairly common. a 20+V supply for 120s or 172s will be somewhat harder to find. Looking at about $120-$200 new for a suitable switch mode supply. I'd link you up but I only have links to UK suppliers
