Victor, Harris, Smith all make good equipment, and you won't go wrong with any of them. I'm kind of partial to Smith, because I like their Mix-In-Tip design, I just think it's safer should you have a flashback occur. But they're all equally good.
The little portable mini-torch units are great if you need ultra-portability, but like the others said, you have to really be conservative with your oxygen, because that little bottle won't last very long. I definitely wouldn't recommend one for a shop torch, just too expensive to operate. Like somebody else said, it's almost as much to fill that little bottle as it is to fill a large one. You're paying for the service, not the gas.