As far as Mosfet's I just ordered some from Newark for $0.76 each. I have used them before and I like the 150 Watt rating plus the low 'on' resistance rating. I'm a newbie here and just starting with the Arduino micros but think these look good.
Dave Stalsworth
Here are the Specs...
VISHAY SILICONIX
IRFZ44RPBF
MOSFET; Transistor Polarity:N Channel; Continuous Drain Current, Id:50A; Drain Source Voltage, Vds:60V; On Resistance, Rds(on):0.028ohm; Rds(on) Test Voltage, Vgs:10V; Threshold Voltage, Vgs Typ:4V; Power Dissipation, Pd:150W ;RoHS Compliant: Yes