Fall head-over-laptops in love with these two star-powered valentines to modern dating. In Must Love Dogs (Side A), Sarah (Diane Lane) posts her profile on perfectmatch. Com and finds she's pursued by a bewildering array of weirdos. Then along comes a soulful boat builder (John Cusack) who's not Mr. Perfect, but he may be Mr. Right if Sarah doesn't pass him by. Next, Tom Hanks and Meg Ryan are eager to hear three little words: You've Got Mail (Side B). Sleepless in Seattle's stars reteam in a tale about anonymous email cyberpals who grow close through their messages and think perhaps they should go on a datee - but what they don't know is that they are fierce business rivals.