I simply cannot imagine why you would want to open a large collection of file directly from the memory card, maybe open a very few by file name as you've noted on your camera's info screen.
For a large quantity of files, copy them all to the PC first.
I'm also getting ready to build a new PC.
I'm figuring on two 256GB internal SSDs, multi layer BluRay discs and 1-2 TB hard drives for back up.
Backup hard drive(s), only one to start with, will slot into one of these.......http://www.newegg.com/Product/Product.aspx?Item=N82E16817998185
I was planning on building in a card reader, didn't care for the number of negative reviews of the ones I found at NewEgg.
Then I found this set up which is Jeff Cable approved......http://www.bhphotovideo.com/c/search?Ntt=Lexar+HR1+Hub&N=0&InitialSearch=yes&sts=ma&Top+Nav-Search=
Readers can be used individually or up to four can be mixed and/or matched into the hub, contents of up to four cards can be downloaded to your PC simultaneously. Even four of the fastest cards should not be able to saturate the USB3 bus.
Back to PC drive configuration.
I briefly considered some RAID possibilities, researched a bit and decided not.
Here's my plan...
Install one SSD, install Window 7, maybe partition the drive into halves for dual booting, 128GB should be more than plenty for my non-gaming OS and programs. My current XP with about 70 programs lives on a 50GB partition that still has 1/3 free space.
Windows up and running, second half of the primary drive left un-formatted, Shut down, connect second drive, reboot.
Use Windows Disk Management to format (and partition if desired) the second physical drive, create a single folder in the root of that fresh E(?) drive, call that folder something clever like eMyDocuments.
In XP, I'm hoping Win 7 is similar, right click on the "My Documents" folder on the desktop, select >Properties.
In the Properties tab is a window where you can specify "My Documents" target location, type e:\eMyDocuments or simple select the browse tab. Windows should ask if you want to move/copy/migrate/whatever the contents of the current My Documents, choose YES!! My Photos, My Music and all those will move right over along with each folder's special properties.
Windows has now "symbolically linked" or "mapped" your "My Documents" to your second SSD, since the default save location for most programs is My Documents, those programs will now automatically save to you second drive.
The idea here is for the OS and programs to be on one physical drive, data on another, each can be backed up separately.
At this point, I sure don't know exactly how DPP and LightRoom will want to play with this set up, when offered options, I'll aim ALL data files to the second SSD.
The external drive dock will be for hot swapping in bare HDDs or SSDs as I choose for back ups.