It would depend on your upcoming beer, but... consider this.
4 oz of slurry = 118ml
According to Mr Malty, you'd only need 130ml of slurry to inoculate a 5gal, 1050 wort. I'd say you have ~ 1.75 vials in hand now. If you wanted to rouse your yeast, just use your 16 oz starter, thaw it out, boil it for 10-15 minutes to kill any baddies, chill it and pitch your yeast slurry into it before starting your brew day tomorrow morning.