Currently, I've got two, an EllaRoo wrap and an ErgoBaby.
I am really considering an Ergo Performance for DH because the fabric is wick-away and the strap padding is sleeker than the original and the Sport. Also, the chest/back strap is a lot easier to slide up/down than on the regular one. The sole drawback to the Performance, in my opinion, is that it's not compatible with the hip-extender belt, which might be an issue for DH if he doesn't lose any weight.
I'm looking into a Beco Gemini for a friend who's talking about TTC #2. (She had a Bjorn, so she gave up on babywearing with her first. Sad, really.)
Both carriers spend most of their time in my car - I use them to go shopping. (Except to the mall. The stroller is more practical if I'm shopping for myself!)
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle