Street legal electric bike kit?

[beargardens]

I'm having trouble finding astreet legal (under 20mph for the USA) electric conversion kit. I'm a poor college student just looking for something to get me to campus a littles less sweaty. Ground's primarily flat and I'd rarely be looking at biking more than 10 miles round trip. (one thing I don't understand is if these bike batteries hold their charge as I wouldn't be able to charge it on campus/at work) I weigh 120 pounds and my bikes 26".
My price range is about 300-600$ but cheaper the better
is it possible to get something dependable for that?
I'd potentially go higher for a warranty
I'm at a loss but here are some I've been looking at

ELECTRIK MOTION-"Quality Electric Powered Bikes & Scooters"
Wilderness Energy Hub Motor Kit. BEST PRICES AND FREE SHIPPING!!
AmpedBikes.com - High Quality Electric Bike Conversion Kits

anyone have any experience with these?

 

[john]

Have a look at www.ebikes.ca Homepage of the revolution
All their product is good quality, as is their service and they are very knowledgeable. Consequently their reputation is very good too.