Better off buying standard case then install front usb3?

[irishred]

I know there are motherboards that have usb3 capabilities but no headers. Then there cases that have front usb3/esata/audio but again no headers. Will I be better off buying a standard case then install front ports panel? Should I just buy a single usb3 port and add that to the case? Will that limit the speed?
This is the MOBO I want to buy:
GIGABYTE GA-890FXA-UD5 AM3 AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
Also would a mid tower gaming case fit this card? Will it be too cramp for airflow. I'm not a heavy game so no plans to buy 2nd card. My psu is 850w
Sapphire Radeon HD 6870 1 GB GDDR5 DL-DVI-I/SL-DVI-D/HDMI/Dual Mini Display Port PCI-Express Video Card 100314SR
Thank you.

 

[irishred]

I know there are motherboards that have usb3 capabilities but no headers. Then there cases that have front usb3/esata/audio but again no headers. Will I be better off buying a standard case then install front ports panel? Should I just buy a single usb3 port and add that to the case? Will that limit the speed?
This is the MOBO I want to buy:
GIGABYTE GA-890FXA-UD5 AM3 AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
Also would a mid tower gaming case fit this card? Will it be too cramp for airflow. I'm not a heavy game so no plans to buy 2nd card. My psu is 850w
Sapphire Radeon HD 6870 1 GB GDDR5 DL-DVI-I/SL-DVI-D/HDMI/Dual Mini Display Port PCI-Express Video Card 100314SR
Thank you.

I forgot to add that I want to have a raid setup. I only would like to have a raid for safety of data and applications. I do have a 128gb ssd for os and program files and would like to have two 500gb hard drives.