I was the first person to say that no US network could do the name Top Gear justice, but History channel has gone and proven me wrong. The first couple episodes were a little shaky (what show has everything from the first one though right?), but Top Gear USA has really started to come into it's own.
You can find the show in several places.
Several episodes can be had streaming on History.com
If you want to download them all in either SD or HD Finalgear.com is still the best place to go.