Ok guys, I need help here. I want the twins to start learning how to sit up, but we don't have Bumbo seats, booster seats or high chairs. We're going to need to get booster seats for feedings, because we don't have room for high chairs, but should we get Bumbo seats too? They're expensive ($40 each), but they look so neat. :-) What do you guys think I should do? Buy the booster seats and no Bumbos or get both or just Bumbos??? Heeeeelp!