I'm taking the plunge and am ordering the cards printed 2 by 2 from an on-line photo printer and then sleeving them with colored Deck Protectors (just as Michael has done).
Awesome! Glad you are using my strategy. I think it's very cost effective, especially if you were planning on sleeving anyways!
2) Do I need one copy of each counter sheet or are some of them supposed to be printed multiple times?
You need one copy of each counter sheet. All of them have a back and front, however. Don't make my mistake and put all of them on individual counters. When I have time, I'm going to print out half of the sheets again and affix them to their proper counterparts one at a time...