jessh that's overkill in amps and price for me.
I took apart an Ol Pro-tech nicad charger thinking I could use the transformer as I gave My Nephew my Astro flight Nimh DC charger
Here is a great Size and price for 8.5 amps $30.
http://www.hobbypeople.net/gallery/158300.asp
20 amp model $53.-$82.
http://www.hobbypeople.net/gallery/158301.asp