The "airyness" is mostly determined by the device you use on your e-cig. The cartomizer, clearomizer or atomizer will make the difference there. The vapor is a function of the voltage and the juice. Small battery e-cigs, and most eGos, run at 3.3-3.4 volts. Other larger battery e-cigs run at 3.7 to 4.2 volts, depending on how fresh the battery is off the charger. That extra voltage makes ALL the difference.
You need to take the standard "step-up" into a larger battery PV. Any of the eGo type e-cigs would be an improvement. The "airyness" would differ, depending on what cartomizer or other device you used on it.
My suggestion is not to get wrangled into one of the specialized "systems" of eGo. You can get an eGo-T or eGo-C or eGo-W or whatever. But what you'll be doing is paying for the extra stuff, like special tanks or atomizers, that you may or may not like. You can use regular atomizers and tanks on all those eGos, but why pay for the specialized attachments? Get a PV and try different devices on it to find the one that has a draw you like.
For a first "upgrade", I would suggest getting a kGo. It's like an eGo, but with a bigger capacity battery and a higher voltage, (3.7 vs 3.4). Get a pack of cartomizers, an atomizer or whatever other juice delivery system you want to try. The kGo will take any device that fits on an eGo or anything designed for a standard 510 thread pattern. You can get a complete kit for about $45 from hoosierecigsupply or sweet-vapes or any number of other online vendors.
If you look around here, you'll find many, many people who have been happy with their kGos, and darn few complaints. OTOH, you'll see all kinds of people asking what the heck they're doing wrong to get that plasticky taste on the eGo-T or why their eGo-C is giving them dry hits. So, keep it simple. Get a kGo, or even the smaller battery Riva, but I'm not sure they even stlll sell Rivas in the U.S.. Don't bother with the proprietary systems that the eGo tries to sell you on. It's generally not worth the bother and extra expense.