Nice bike.
I love that style, and coolie cup holder is a nice touch ;-}
I'd stay with the silver motor since you have a silver tailpipe, but they do look great with a black motor and a black tailpipe.
I highly recommend you put a front brake on though, relying on just the stock coaster brake is pretty dangerous.
Speaking of the coaster brake, another thing to consider is bumping the pedal side wheel sprocket up a tooth from 18 to 19 teeth.
It is cheap ($5) and very easy to do, and the lower pedal side gear ratio not only makes it easier to pedal start the motor, it gives you more torque on the coaster brake improving it's performance to the point where you can actually lay a skid ;-}
My bike is a lot like yours, it's a 2WheelBikes.com Maui ($135) but I don't have the included full fenders put on yet.
The Maui is a longer frame, perfect for an over 6' tall guy, but I needed to get the $15 optional mounting package with the extra long front studs and extra front mounting extender.
If you do put a bigger rear sprocket on, I also recommend you consider re-doing both your chains too since you will need to lengthen the pedal chain anyway.
Size your drive chain to fit perfect with no tensioner to no more 3/4 of the way back into the chainstay grove mount, then mess with the pedal chain.
Size up the pedal chain best you can, 1/2 links can really help here, but you can't match them put the tensioner on the pedal side.
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