The voters
[spoiler]The voters would be made up of a group of (hopefully) all citizens. This group is not limited by age, but by knowledge (yes, a 5 year old can possibly vote for who gets to elect the government. The beauty of this system is that only the people who can make intelligent decisions are given the right to vote for the fate of a country (What I hate about America [and probably most other countries for that matter] is that some half-brained middle school dropout has a say in my future, if he or she chooses, no matter how limited.)
To be in this group, a voting license is required and to obtain it a test must be taken and passed (something in the realm of a high school level test, like the SATs but perhaps shorter.)
each person in this group must vote for 1 person in each category (each different speaker position) and the nation is divided into 100 different regions based on population of registered voters.[/spoiler]
There is a reason that the founding fathers made the voting age as high as 21. They do that because young people are uninformed idealist (much like yourself) who lack wisdom from experience. To not limit voters by age is a ridiculous concept. To take away the rights of people because they aren't smart or educated is wrong. All men are created equal and no one should take away their unalienable rights. Your idea is no different from Democrats creating literacy tests to prevent blacks from voting.
The only thing I disagree with is the fact that everybody over 18 magically has an informed opinion (I don't know why you put 21, was that the initial age limit or something?). I know some extraordinarily smart, politically informed and realistic kids in high school, and some amazingly stupid and uninformed adults. In my opinion, the best voting system would be one where you can vote after age 16, and taking a test every time you go to vote. However, the test would not be anything difficult to pass, it would just be on basic aspects of the actual election (i.e. you need to understand you didn't just vote to make pot legal, you instead decriminalized small amounts). The answers would be in a pamphlet you could read before taking the test, and you could take it multiple times in a row. The big thing is, you need a very basic understanding of the issues you're deciding on. Even though everybody who was vaguely literate would be able to pass after reading the pamphlet and trying once or twice, it would ensure that people had some idea what they were voting on. As far as this being discriminating against any groups, the same test would be used nationwide. The only people it discriminates against are illiterate people, and I gotta be honest, if you can't read, how on earth do you make the choice on the ballot?