Diamondback has been in the game since 1977. Another company from the American pacific-northwest, Diamondback bikes are usually written-off for the budget-minded folk (think Christmas presents for midwestern teenagers with bowl haircuts), but not so fast.
Diamondback has a great range of high-performance competitive road and mountain bikes out there and they certainly don't look like the underdogs in today's market. They even have a nice line of Ebikes with lithium-ion batteries worth looking at.