This is my first post and I'm still learning about bitcoins. I have 2 block erupters mining at 671Mh/s. I joined this forum to learn more about mining bitcoins. I'm currently researching what hardware to get next. I was thinking about Blackarrow's since they have a pretty decent price per Gh/s. They do have a reseller here in the US called minersource, but I'm not sure how trustworthy this brand is since they seem to be pretty new. Does anyone have nay advice? I was also looking at the rate at which dificulty rises and with this pre-order market it looks like the dificulty might be kind of high by the time one gets their preorder. That worries me because I'm trying to get into this to make some extra money.