Sounds like you have an interesting project being planned!
If you are only doing this as a personal project then get homeowner grade and not professional grade tools. For this type of project I would suggest getting a tile cutter from Harbor Freight Tools. Harbor Freight Tools - Quality Tools at the Lowest Prices
SALT LAKE CITY, UT 3470 S. STATE STREET 801-484-9556
There you will find a reasonably priced selection of tile cutters and many other homeowner grade tools. The one I occasionally use is their biggest but it fit my budget ($300) and is easy to use.