Try Hobbytron if you're looking for a PWM with 'balls'. Their CE-CK1400 will handle 5A @ 100VDC and has a pot for speed control. You would have to solder it. But, at $15 US (If I remember correctly) it includes a PCB and all the parts (which number about 15) and would be a good project to learn soldering on. Its got discrete components, an IC, a couple jumpers, all kinds of different leads for you to learn on! Besides, to buy it pre assembled would probably be about $20-30 US, and methinks you aren't going to spend that much on this simple of a project.
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Fix reason firmly in her seat, and call on her tribunal for every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason than that of blindfolded fear.
-Thomas Jefferson
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