I think EVS systems could be very accurate as long as those who control the software for the EVS systems are honest...! The best way to insure this would be to allow specially embossed receipts to go to the voter with another copy kept for recount purposes. A voter could always have his his receipt checked and the copies could be tabulated against the machine in case of fraud. The paper could use the same type of threading and security bands as our US paper money. Yeah I know it would cost more but I would pay an extra tax just to see that our elections remain honest and verifiable.
EVS's are one leg of reform, but the other leg...the human controllers/programmers still needs attending to!