ORIGINAL: perreback
People seem to have bad experiences with ordering items that are on back order. If I were you I would wait until it is in stock.
So far the back orders I have done came in about the time they quoted or sooner. They may get in 10 of these items and they fill there back orders first. If you are number 11 then you will be number 1 when the next batch comes in. They do try to get more though so they have them in inventory but sometimes they just can't get enough of some hot items to keep in stock. If you don't put in an order you may never get some items. That's why Pay Pal is a good idea when dealing with HK.