Tim is right, sulcatas get ALOT bigger then leo's. Second, if the initial purchase price is at all a concern, a tort is probably not for you. The one thing that all torts have in common is that they are not "cheap" pets to keep. I wont lecture you to death but large enclosures, lighting, heating bla blah blah gets expensive. Not to mention outdoor summer enclosures ect! Do you homework on these torts BEFORE you get one!!!
Anyway here is the lodown. Sulcatas get BIG, wait HUGE rather. THey both have about the same temp/humidity/dietary requiremants. Generally sulcatas are usually considered more hardy, and personable then leo's. That being said I absloutely love my Leo and don't find her too difficult to care for (but she is still quite expensive even after initial set up costs).
My reccomendation is simple. Do your homework and get what you think you can handle (if you want your furniture rearranged then get a sulcata). I always reccomend redfoots and any of the smaller torts (russians, greeks, hermanns, ect...). Redfoots have great personalaties and have less strict dietary requirements (they can eat some fruit).
Good luck....
-Ian
P.S. hope this doesn't seem to harsh, it isn't meant to be...