I will go with Mini DisplayPort to DisplayPort Adapter Cable:
http://www.amazon.com/StarTech-6-Feet-DisplayPort-Adapter-Cable/dp/B002XVYZ82
Now about RAM. Here is what I found so far (2012 Mac mini compatible):
Kingston

System Specific Memory: Apple Mac mini (DDR3) Core i5/i7 (Late 2012)
8GB Module - DDR3 1600MHz
Part Number: KTA-MB1600/8G
HTS: 8473.30.1140, ECCN: EAR99
http://www.kingston.com/us/memory/search?DeviceType=2&Mfr=APP&Line=Mac mini (DDR3)&Model=80279
Crucial

DDR3 Upgrade for the Apple Mac mini (Late 2012) Desktop/PC
16GB kit (8GBx2), 204-pin SODIMM, DDR3 PC3-12800 memory module
Part Number: CT3650286
Module Size: 16GB kit (8GBx2)
Package: 204-pin SODIMM
Feature: DDR3 PC3-12800
Specs: DDR3 PC3-12800 CL=11 Unbuffered NON-ECC DDR3-1600 1.35V 1024Meg x 64
http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=357C4175A5CA7304
Which is the fastest, i.e. providing minimal latency: could not find any info for Kingston?

Any other suggestions, please?