Ngk vs autolight
#1
#4
Go with the suggested NGK plug. Make sure your getting the right plug though. 5.50 sounds a little cheap to me. If your bike calls for the iridium plug, don't get anything less or the bike won't run correctly. The ignition system on bikes are pretty weak, and if the wrong plug is used, you get the most out of your system.
#5
Never buy spark plugs for your bike from any motorcycle store or shop. You can have most local auto parts stores special order the exact same plug for nearly half the price and usually have it the next day.
When I changed the NGK Laser Iridiums in my 954 I found them for under $10 per plug at Advance Auto. The cheapest I found them from a motorcycle related store was $17.