Heaven Gifts quite recently changed their eGo kits to include the eGo cone atomizers (Type A) but have since made the Joye 510 atomizer and seperate cone an option at the customers request. I think if using carts I'd prefer the eGo atomizers over the 510 type anyway. Looking at the pictures on FSUSA's site and putting 2 + 2 together I'd guess their source is HG.. Perhaps FSUSA should change their site though as it still says it comes with Joye 510 attys.
I think the regular 510 is the better choice for now, alot of places don't carry type A attys or carts yet. I like the B atty's so far but I don't know how good the carts are my pack of B carts is still unopened and I debridged both my B atty's.