Btw just a heads up but stuff like the t3i's are manual focus when your recording, it will auto focus before you start capturing but then it's manual focus after that, if your going to be vlogging then is wouldn't recommend a dslr unless you have some decent shoulder muscles to be able to walk around holding up a camera a dslr at your head level.
If you are just filming vlogs at home then dslr cameras would be fine, because you won't be moving round much so no need to re focus and you can have it on a tripod so no need to hold it.
If you want one to take around I would recommend something like the canon s100, much cheaper then a dslr and much smaller, it's also a very popular camera for vloggers who like to film when there out and about and I also know its quite a well used piece of equipment in the YouTube vlogging scene over in LA