Paolo had an excellent tip about running the floppy cable UNDER the mb when you install. I did this on both my aopen's and it looks neat, works well and lasts a long time. I have an aopen ax63pro as well which has the udma support built in as well as voltage adjustment.
I'm in canada and have seen the ax6bc at clearance places for 80cdn (54usd)
I assume the ax6b is just a larger board?