Well with only an int amp that doesn't have digital processing, that optical output from the TV now needs digital processing of sorts... or a DAC. That's why I almost always go with a receiver over int's if TV or DVDs are also in the mix.
There's plenty of inexpensive dacs to look at though. Googling for TOS to analog converters might help. It will needs be a stand alone unit however having it's own power supply or wall wart at least.
Another cheap idea is to get one of those HD boxes people had to get to get aireal TV when everything finally stepped into the digital realm. They shouldn't be very pricey, and I'd suspect under $100.
Integrated amps are great items as long as they remain in the analog only arena. When any digital is to be added, recievers pay for themselves with their added flexibility in that area.