For soda, make sure you're buying Bevlex line. The stuff seems to be industry-standard; very high quality dual-durometer line.
Stainless-steel faucets will be fine for soda too. Soda isn't acidic enough to corrode a perlick or even a standard faucet. Perlicks would be highly recommended though, just to avoid faucet stick.
A very easy way to distinguish soda taps from beer taps would be to make taphandles out of old action figures