1) they can do other practical things with, i.e., e-mail, scheduling, photo/movie editing, etc.
2) they can also have fun with, i.e., play a game, watch a movie, do video conferencing, etc.
3) that looks like a normal computer
4) for the best value for the money available
That kind of limits the 'high end' design to a two card system, but that would still be a killer way to get started and start acquiring all the necessary skills to advance to more complicated rigs if so desired.
How about we design a couple of options for folks who want all the above options (not all at once, of course ) while mining DGB at the same time?
So here we go... Just a miner to put on another location where electricity is cheap.
Use it as for Fileserver etc....
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graphic
http://www.ebay.com/itm/Sapphire-Radeon-HD-7950-PCIE-3-0-Video-Card-W-BOOST-Dual-X-/331324461986?pt=PCC_Video_TV_Cards&hash=item4d247a13a2
Sapphire Radeon HD 7950 PCIE 3.0 Video Card W/BOOST!! Dual-X
120$ x 4
480
power
http://www.ebay.com/itm/Corsair-Professional-Series-AX1200i-80-PLUS-Platinum-/231336327136?pt=PCA_UPS&hash=item35dcb837e0
Corsair Professional Series AX1200i 80 PLUS Platinum
230$ x 1
cpu
Intel Celeron G1610 2.6 GHz Dual-Core Socket 1155 CPU Processor SR10K Ivy Bridge
http://www.ebay.com/itm/Intel-Celeron-G1610-2-6GHz-5-0GT-s-2MB-LGA-1155-Ivy-Bridge-CPU-Processor-Retail-/151414958433?pt=CPUs&hash=item234108e961
39 $ x1
ram
G.Skill Ripjaws 8gb (2X4GB) DDR3-2133 PC3 17000
http://www.ebay.com/itm/G-Skill-Ripjaws-8gb-2X4GB-DDR3-2133-PC3-17000-/221552973092?pt=US_Memory_RAM_&hash=item3395961524
20 $ x 1
SSD
Kingston 64GB SSDNOW V+ Series SNV225-S2/64GB Solid State Drive
http://www.ebay.com/itm/Kingston-64GB-SSDNOW-V-Series-SNV225-S2-64GB-Solid-State-Drive-/221550080850?pt=US_Solid_State_Drives&hash=item339569f352
35 $ x1
System
Linux or Microsoft?
Coolersystem for low noise!!!!
ARCTIC-Accelero-Xtreme-IV
http://www.ebay.com/itm/ARCTIC-Accelero-Xtreme-IV-280-X-DCACO-V930001-GBA01-Radeon-R9-280-X-GPU-Cooler-/331263007207?pt=US_Video_Card_GPU_Cooling&hash=item4d20d059e7
100$ x4
400
Mainboard
H61 Pro BTC
http://www.ebay.com/itm/AsRock-H61-Pro-BTC-/281442460010?pt=DE_Elektronik_Computer_Mainboards&hash=item418747216a
60$ x1
You can upgrade your rig to 6 cards!
PCI extension
1X to 16X Powered PCI-E PCI Express Riser Card Extension USB 3.0 + SATA Cable
http://www.ebay.co.uk/itm/1X-to-16X-Powered-PCI-E-PCI-Express-Riser-Card-Extension-USB-3-0-SATA-Cable-/201027687159?ssPageName=ADME:L:OU:DE:3160
6,50$ x 4
26
Alu Frame Case
http://www.ebay.com/itm/Aluminium-Open-Air-Litecoin-Mining-Rig-Computer-Frame-/251649239604?pt=US_Computer_Cases&hash=item3a9776aa34
40$ x1
Time to Setup around 48 h
Costs around 1330$ without silence ~ 930$