Pass. You know this whole ordeal is going to be a headache and keeping that bust around will also be a headache due to it's size. The shipping box alone will eat up a ton of space.
I would not get it for a while. Sit on the idea for about a month and if you still want it later then buy the bust through SS. They made 1500 of these and at $700 bucks a pop I doubt they are flying off the shelves. Not to mention the paint and QC issues they are having with this product. The die-hard Iron Man fans and the shopaholics will keep hounding you to buy this bust till the next "Grail" comes along. Best thing to do is sit and really think it through. I know you are a perfectionist and this doesn't seem to be a product that you will likely be content with.
Just my 2 cents.