The express kits are made to work with the cartos just fine. The ecig you get in the express kit, is the very same battery you'd get with the bigger Volcano kit, you just get less stuff. Honestly though, I wouldn't buy it. The battery life is pretty short. It works well enough for a small battery, but the life is very short, maybe 20 minutes of constant vaping?
Now I like the Volcano brand a lot. The Magma kit would be a step up. Though a lot more expensive, in my experience, the set up works pretty well. With the charging pack, you vape on while you charge one, and it keeps up pretty well. I'd say this battery lasts about 45 minutes maybe. If Volcano is what you're going to go with (good brand IMO, my favorite personally, but certainly not the only good brand out there), you either want the Mega Magma battery, or the Inferno kit. The battery life is much more impressive with these. My Mega Magma lasts about half to 3/4 of the day.
You could piece together a basic kit with 2 Mega Magma batteries, a usb charger, a pack of Mega Clearos or Cartos, and a bottle of juice for about $65. About $10 less than the Inferno kit itself. I've never used an Inferno, but I hear really good things in their forum and chat. So I guess the question would be what do you want? Does your ecig need to look and feel more traditional? Or is a mod style okay? And for the record, there are other good brands too. You're not limited to Volcano.