Thanks, kh54s10. I ended up using both Mrmalty as well as Yeastcalc to get a better idea of what I would need to pitch. I made a 1L starter with a Wyeast 1450 Smack Pack born on 5/18 and had it on a stir plate for 20 hours and then put it in the fridge. After about 10 hours, I decanted and stepped up with about another 1.2L of wort. I left that on the stir plate overnight. The next morning (brew day) I activated the other Smack Pack and let it swell for a few hours. About an hour before pitching, I added it to the starter on the stir plate. I originally wanted to pitch a starter into one carboy and just a Smack Pack into the other to see what the differences would be but got nervous about under pitching. I just evenly split the yeast between the two carboys.
Holy cow did these things take off. After only a few hours from the time I pitched the yeast, there was activity in the airlocks. I got up the next morning and one of the carboys was gracious enough to create a nice little project for me... yes m3n00b, I should have had blow off tubes right off the bat. I did use Fermcap but apparently not enough. I'll be making starters for every batch here on out now... and I'll be sure not to forget the blow off tubes.