I say ditch the front rim brake, they are no match for a disk when it comes to smooth flowy riding, any chance of one on the rear? That would be ideal.
if the frame has vee mounts stick with vees, I LOVE vee brakes, HOWEVER, for street riding, I found they rattled about a bit too much and tended to make the riding seem a lot harsher than it was. Magura's are crap, but the best for a quieter bike.
as for pads, it depends on what rim you have, if it's a smooth anodised rim, then some pads meant for a grind would actually work well if you want it to be quiet (TNN, Phatpads, Rocks pads etc) if it is ground or has been ground, then you will either have a brake with lots of noise with pads designed for trials and a grind, or stick with your current pads and put up with the lack of hold.