a switch is a switch, and as long as you don't exceed its amp/voltage (usually max ratings for switches are 120v-240v / 2 - 20amps) ratings you can use it with no problems, that switch seems a bit overkill to me, having quick connectors but yeah it would work just fine.
wattage does play a role, but i did the the math a few days ago and the wattage generated by each led
is under 1/4 watt (250mW) and the most common resistor wattages are 1/4w (250mW) or 1/2 (500mW) so it doesn't really make a difference. using a larger wattage resistor won't harm anything, and it does offer a small cushion of protection if something unforeable was to occur. my final opinion use
and what kind of radio shacks do you have maryland anyway? they don't have a broad selection of switches, resistors or anything good. my 5 local stores are stocked to the gills with stuff, and its kind of bad i have a better idea where stuff is in the store than most employees.