All four of those are possible the best R9 280x you can get. The Sapphire Toxic though is the best of all four but! It requires more power, larger, $40 more expensive and some reviews had reported unstable clock.
My best bet is you get the ASUS R9 280X or the MSI R9 280x. Both are great but the ASUS has the highest clock of the two though the MSI R9 280x can easily Overclock the the ASUS's clock...
All four of those are possible the best R9 280x you can get. The Sapphire Toxic though is the best of all four but! It requires more power, larger, $40 more expensive and some reviews had reported unstable clock.
My best bet is you get the ASUS R9 280X or the MSI R9 280x. Both are great but the ASUS has the highest clock of the two though the MSI R9 280x can easily Overclock the the ASUS's clock.
So between the MSI and ASUS you choose.
I myself am getting the ASUS R9 280x.
Be wary if your PSU can power this card, it requires 30A and a 550W minimum
The ASUS R9 280x DC2T is probably your best option. It has performance somewhere in between the toxic and stock 280x. While maintaining a good price and good cooling.