A few questions

Hey there. The J&J Ceramic is most likely the same thing as the "Full Ceramic." Did you see them on different sites? It could be just a difference in description. And yes the 20" will perform the same as the 14", so if that's the look you prefer, then I don't see a reason not to get it. However, longer barrels can make it difficult to tuck into bunkers should you fall under fire.

As for the HPA tank, the Pure Energy aluminum and steel tanks seem to be good "starter" tanks. Don't expect to get more shots out of it though. Out of that tank, I'd estimate about 800ish shots. Out of a 20oz. CO2 tank, you can get around 1200. The advantage of HPA is greater consistency and stable performance in all weather conditions.

Edit: Were you referring to the J&J "Full Tilt" barrel? If so, it's just a 2-piece verson of the regular Ceramic. I don't think it would offer any advantages over the 1-piece ceramic, other than looks. But I've never used the Full Tilt, so I can't say for sure.

No problem, it's why I'm here. :)

Basically for HPA, your advantage is in the consistency and stable performance. This can help increase shot to shot accuracy, and is seen to be a vast improvement over CO2. I personally prefer HPA to CO2, but consistency and stability are its only real advantages. However, if you are shooting slowly, CO2 should be fine for an X7. But that kind of defeats the fun of an E-Grip, don't you think? As for recommending a different tank, I personally like my PMI fiber wrapped 68/4500 tank. It cost me $160, and that was a cheaper tank as well, but it's lighter than the stell and aluminum tanks and you get many more shots. If you do get an HPA tank, make sure it's "high pressure output." HPA tanks use a regulator to limit the air that goes into your marker. They have high pressure (HP) output regs and low pressure (LP) output regs. HP is regulated to about 850 PSI, which is similar to the output of a CO2 tank. LP tanks are regulated down to about 450 PSI, and are only really good on today's market for Angels so it seems. If you get a LP HPA tank, you will experience serious shootdown, or loss of velocity at higher rates of fire.

Also, a note on HPA: On your Tippy, CO2 will work just fine. But if you want to upgrade to a "high-end" electropneumatic paitnball gun, HPA will be required. If liquid CO2 gets into the solenoid (electronic valve used to control airflow within the marker), it will over-pressurize and break. But like I said, you don't have to worry about that now.