As far as powering and controlling the speed of the DC pumps I used....
I recomment going with the 24v versions of these pumps instead of 12v. The 24v are more powerful. these pumps are food grade and rated for boiling temps. there are many sellers selling these. I have bought 5 from 5 different sellers and they are all identical with the same pps coated magnets .
http://www.ebay.com/itm/36116338235...49&var=630516827839&ssPageName=STRK:MEBIDX:IT
I have used two different types of speed controllers for the pump motors (These are not needed but they are a safer and easier way to control pump speed and prevent stuck sparges in my opinion) they are very easy to wire up...power in and power out to pump.
http://www.ebay.com/itm/12V-24V-36V...764?pt=LH_DefaultDomain_0&hash=item418d82efcc
These are slightly better in my opinion. You can find these much cheaper than this if you search.
http://www.amazon.com/dp/B009HKFAIQ/?tag=skimlinks_replacement-20
These are a pretty nice alternative I just discovered and havent tried yet.
http://www.ebay.com/itm/261678264066?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT
for the main pump power switches I used these led illuminated switches. Just make sure to order the correct 12 or 24v switches or the light wont work. they are also available in many colors. (you need to solder or use small narrow spade connectors to install.)
http://www.ebay.com/itm/5PCS-16MM-R...703?pt=LH_DefaultDomain_0&hash=item27dbb79387
And finally power supplies....
if you are going with 12v all you need is a 2-3amp supply to run a couple pumps at once like this.
http://www.ebay.com/itm/12V-3A-DC-P...113?pt=LH_DefaultDomain_0&hash=item3378c8b349
I prefer this type, although I found a better 3 amp version for $8 shipped with some searching... keep in mind more amps wont hurt anything but each pump needs about 1 amp to run correctly.
http://www.ebay.com/itm/161285389741?_trksid=p2060778.m1438.l2649&ssPageName=STRK:MEBIDX:IT
http://www.ebay.com/itm/S-25-12-Sup...849?pt=LH_DefaultDomain_0&hash=item339dbb1201
I upgraded to 24v dc so I went with a 6 or 7 amp supply but this 5 amp would be more than enought to run all the pumps and relays and still power a dc fan to cool the ssr heatsinks...
http://www.ebay.com/itm/1x-24V-5A-1...884?pt=LH_DefaultDomain_2&hash=item2a32fe86cc