J.G.
Yeah - I was going to say - I'm in the same boat and having talked to a lot of second time moms with 2 under 2, they all said they carried baby for the first 3-6 months. It just made life easier!
That said - I know its not always so fun to carry baby (especially if they end up being huge and you are tiny) so in terms of strollers: We've pretty much decided on a Phil & Ted's. Its the smallest and most compact. The only complaint I have about it is that the storage on the bottom sucks. Hard to access. But its easy if the bigger baby wants to get out & play. You can also get a car seat adapter for then they are very little.
I looked at the Joovy Ergo too. I thought I'd get it but the reviews are terrible. Also I can't find a local store who sells it so I can try it out... Both negatives in my book!
Good luck!