I totally see what you're saying, but personally I like the added bulk. It's not THAT much, especially compared to other ext. batteries, and I have a bad habit of putting things on my lap and forgetting them when I stand up, so it's nice to have that added weight to remind me not to be a dumb ass. I do love the way the standard battery feels and I especially love that my silicone case fits it perfectly, but now I have 0 worries about battery life, can have everything sync constantly, and won't stand up with something nice on my lap, sending it flying, only to crash hard.
I thought you hated your Bionic anyways? Just sell it on Ebay and apply that money to the extra $9.99 a month for getting a new line w/ a new phone. I think you're aware of what's around the corner.