The best quality is with a TV tuner card, but just watch out for the resolutions, those with like 372X256 (example) have lower resolution than the PS2,
you can get a good one from ATi, they offer one with 800X600 resolutions, that is better than game console.
with that i guaranteed no lag, if you have the right setup, theres no reason for lag.
just go to your local "computer saler" and ask him.
remember the resolution!! and the sound now came from your PC sound card= best
you can make video , pics etc...