We have a Venicci system, inherited from DH's niece, which did what we needed it to do but is an absolute bastard to fold and is now falling apart a bit after two kids worth of heavy use.
For replacement, I'm eyeing up the Maxi Cosi Leila and their Marble car seat, as we used the carrycot section a whole four times, and a lot of the time the toddler will be in the buggy and baby in sling at the start anyway.