If the issue is with the insurance, try to get more GPU from the insurance and then use cash to buy the MOBO of ur choice
GD70 is what one of my rigs is using. It's got 5 PCIe slots.


Consider this option.
 - GD70 (5 PCIe slot)
 - 1000W/1200 PSU (support 5x5850)
 - CPU of your choice
 - HDD of ur choice (If theres a need)
 - Casing of ur choice
 - RAM (2 GB + What u want to use)
 - a few other GPU from the balance of $1,800

Piece together a dedicated mining rig using the GD70+Sempron 140 [Purchase ur own], 2 GB RAM, PSU & GPU + Ubuntu/Linux on Thumbdrive (4 GB) [For 5 GPU get 2 PCIe Extender for $9]

As for your own computer. U still have Casing, CPU of ur choice, RAM, HDD & GPU (Assuming you got 3 or more from the insurance). All you need to buy is MOBO and PSU.

You'll get at least 2.5 Ghash/s with a working computer of ur liking + dedicated rig (naked or cheap casing). (total around 5~7 GPU) With a bit more investment.