Hints for buy peac for dell e6320

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Hi
In first, i hope you excuse me about my bad english ; i'am french and learnt this language at school a "century ago" ;-)

So i have a dell e6320 : specs can be viewed at http://www.dell.com/yu/business/p/latitude-e6320/pd or http://www.dell.com/downloads/global/products/latit/en/ap/latitude_e6320_spec_sheet_apj_en.pdf

i upgrade it with 8 go ram and hard disk 1 To ; i used win7 64 bits and linux mint cinammon 64 bits

i put it on a dell dockstation ; i don't know which model ; it has usb ports, parallel and series ports ; i've recently view that it exists a dock station with usb 3.0 ports ; may be i would be buy this one.

I used 2 old displacy (targa 19" 4/3) connected on the hdmi ports of the dock station

I've bought xplane 10 that i can use on linux and windows ; i've also ms flight simulator 2004 (fs9) and FS X (10) ; but xplane is better but needs important graphics ressources to have a correct display of the game

So, il would want to buy a PEAC adaptor and put on it a graphic card to have a better computer able to display better xplane 10

What are your hints, what i have to buy to do that ? i see that exists peac adaptor 2.4 and 3.0 ; these 2 products are compatible / avalaible with my dell e6320

About graphics card (connected on the peac to buy),  i see that the nvidia gtx 750 ti seems to be recommanded. what do you think about that. good "quotient" quality / price

Thanks, in advance for your hints or links (url) where i can see machine (as my dell) which used perfectly what i want to do

Sincerly, your, Richard