Oh lord, I saw "Welcome to the Dollhouse" in theaters and it's fantastic. Would love to see it again.
"Happiness" was very acclaimed when it was released; I actually never saw it, but read the screenplay. It seems to have been "forgotten" but glad Criterion is digging it out of the vaults.
Also I would love to see "The Opposite of Sex." It only ever got a DVD release. Has a great cast (Martin Donovan, Lisa Kudrow, Christina Ricci, Lyle Lovett, Johnny Galecki). It's extremely funny and unpredictably profound. Would looooove it in at least HD.