@op first of all why crossfire it's better to be with a single gpu because of the heat output and increased power consumption, a single 270x is fine for 1080p gaming
Since the OP has also mentioned about video rendering along with gaming... I would suggest thinkdigit's 60k config (amd)
Processor
AMD FX 8320
10,400
CPU Cooler
Cooler Master Hyper 212 EVO
2,600
Motherboard
Asus M5A97 R2.0
7,300
Memory
Corsair XMS3 4 GB 1600 MHz
2,600
Graphics Card...
Hi Guest we just wanted to alert you to a major change in the forum. We will no longer be allowing the posting of outgoing links. Please use the attachment feature to attach media to your posts.