Got an
XFX R9 390 (actually, got 3, but 2 are going into rig for a friend). Ordered before the price went up from $305 to $320. Getting 25 MH/s, default clocks and voltage. Added to my mining rig where it's happily hashing with it's smaller sibling R9 380s, for a total of ~65 MH/s for the rig.
I have room for 2 more cards on this motherboard, via PCI-E x1 powered risers, which use USB 3.0 cables. I had 2 already, but bought 3 more from user mintcell on ebay, and they are working fine if anyone is looking for somewhere to buy them from. Also bought a FSP 850W Hydro G (AnandTech recently reviewed the 750W model) to run the cards. May get another if I buy more 380s or 390s.