HELP

Car seats.

Oh car seats.

What to do about car seats.

First, the scene:

Child One: approx 30 months (2.5 years), 35 lbs, tallish.
Child Two: approx 4 months, 16 lbs or so, tallish.

The situation:

Child Two is in a bucket seat and, based on my current predictions, will be in it until March-April or so. AT THAT TIME.... we need to decide our next car seat configuration. Child One currently has THREE car seats. A Britax Roundabout (Because we are nothing if not gullible yuppie wanna-bes.... and it was low-profile and on sale.), an Evenflo something-or-other (it looks like a papasan chair.. maybe this) & an Eddie Bauer over-the-head bar seat that I can't find a picture of but it doesn't really matter....

So can Child One graduate to some sort of booster seat soon? Any suggestions? I want, of course, safety first but I also really want low-profile (think two car seats & a dog in the back seat of a Toyota). And I want.... cheap.

There I admit it. I want cheap. And I want convenient. And I'm looking for the best compromise of safe, cheap & convenient. (I say this because I felt a lot of guilt over turning Child One's car seat forward facing at 13 months when I learned my sister-in-law was horrified and couldn't believe it.... she is ALL ABOUT safety. So the next time she visited we let Sweet Boy drive home from Nana & Papa's.... we're rural like that.)

So advice, criticism, website referrals and honest opinions would be welcome.