IMO the best PCC for 510 is the one NoSMokeVA.com USED TO HAVE. It accepts manuals (which are all I will use and what I recommend) and the NoSmokeVA PCC ($29.95) holds 2 batteries w/ 1 charging) and 6 other items. Unfortunately the shop seems to be gone, replaced with another shop that does not seem to have the PCC alone. This is what it looked like (here part of a kit - they have a kit w/ white 510 and a kit with black 510)
http://www.vaporslounge.com/product.php?id_product=12
Did you check Volcanoecigs to see if they sell their Magma PCC seperately? Magma is 510 - here it is but you would have to get whatever USB cable it needs to be charged
http://www.volcanoecigs.com/m-pack.html
That Vogue-Tec is not something you can buy - that is a wholesale shop. If you order 1000 of them I am sure they will try to make them for you.
BTW - this is how much the metal ones hold
http://www.ajscoolvapors.com/products/Joye510_PCC.php
If you have mega xl 510's then you have no choice - you have to get the sharp-edged metal one (Joye 510 mega PCC)
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This is my VaporMaxx PCC I got at NoSmokeVA.com when they sold them
Anyone know anyplace else that sells this kind of PCC for 510?