I would avoid it. You are going to probably hit a wall with your vram. 1GB is simply not enough at 1080p.
The VRAM wall will hinder your performance.
If you can source a 7870 Tahiti (LE) for a similar price to the Pitcairn 7870 that would be the best choice.
Either way, 2GB of VRAM is almost a requirement for decent settings @ 1080p
I have a vanilla Pitcairn Sapphire 7870 - its a wonderful card, without a doubt.