SparkFun has been a fan of Arduino for a long time. We've programmed ATMega328s (and 168s, and 8s before that), written tutorials, and hacked all sorts of fun projects. But now the market is maturing and we are looking at a lot more ARM chips. One advantage of the newer chips is that they generally do not need a USB-to-serial adapter; instead they have USB built in (at least the ones we are using do). You still need to add a bootloader to use them with Arduino, and since ARM programmers are also a little more complicated than AVR programmers you'll want to invest in a stand alone programmer instead of trying to use the Uno you have laying around.
A few ARM boards:
|The Due: Arduino's first ARM board||MKR Vidor 4000: One of Arduino's newer Arm boards||RedBoard Turbo: One of SparkFun's newer boards||SAMD21 Dev Mini: One of SparkFun's ARM boards||SAMD51 Thing Plus board: SparkFun's newest ARM board|
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