You have to use slitting saws to do microchannels (whitewater design) anyway so your lucky you have acess to the right equipment. I have use 1/64 channels in my latest block, it worked very well
For a pump you need to get something that is recognised as a good watercooling pump. try something like a Hydor L30 or Danner Mag3 they are nice and cheap but are also pretty good pumps.