Is DH55HC mobo adequate for i7 870 CPU?

[dctatts]

Hello, the store building my new system is suggesting the DH55HC motherboard for my i7 870 CPU. I was surprised they didn't go with the DP55KG with seems to be standard with the i7 870.
I do not overclock (which is why I don't need the 875) and I don't game, so I won't be running two graphics either. Basically I just do a lot of multitasking, downloading and assembling at high speeds and rar'ing unrar'ing files in the 5 - 10 Gig range. The system will have 2 internal SATA 300 drives and 3 Sata 300 drives in a mobile rack backplane.
Going with the DH55HC will save me around $100 CAD but will I be sacrificing performance? Or is it appropriate for my needs? Thanks.

 

[dctatts]

I should add I run a dual display setup, playing 720p MKV rips on an HDTV while doing everything else at the same time on my monitor. Graphics card is
SAPPHIRE HD 5750 1GB GDDR5 PCI-E
and the audio card is Creative PCI Express Sound Blaster X-Fi Titanium.

I don't know if any of that makes a difference in which motherboard it better suited to my needs.