7-day Ordinary pass costs you 28,300 yen. They will calculate how much you need to pay in US$ based on the exchange rate on the day you purchase it. It should be around US$260.00.

One-way Shinkansen ticket from Tokyo to Kyoto is 13,420 yen (ordinary) or 13,720 yen (ordinary, Nozomi). So if you travel between Tokyo and Kyoto ONLY, then I would recommend that you buy individual Nozomi tickets in Japan instead of a rail pass. As previously posted, there are only 2 Hikari service each hour (leaving Tokyo :06 and :36) and Nozomi is much more frequent and convenient. But if you decide to use a railpass, and 7-day will work for your itinerary, I'd recommend Green (First class) pass. The difference in price is only 9,500 yen (37,800 yen vs. 28,300 yen) and the seat is much nicer, the car is quieter, and usually green cars have more seat availability. They would even give a wet disposable napkin, but no free drinks! Holding a pass does not guarantee you a seat on the train you want to take. You will need to make a seat reservation after you convert the voucher to the pass. You can ride any Hikari or Kodama Shinkansen without seat reservation, but only in one of the "Non-reserved" cars - usually cars #1 to #5. In those cars, first come first serve so grab a seat quickly! (A tip - if you didn't have time to get a seat reservation, get on any of the reserved-seat cars and use any vacant seat. If a passenger shows up with the seat-reservation, then just give it up and find another. When conducter comes to check on your ticket, show your pass, tell him/her "Kyoto" and smile! Usually they let you sit there. Keep changing seats until you get to Kyoto.)

In anyway, taking Shinkansen is the way to go from Tokyo to Kyoto. Hope this helps, and you will have a good trip!