Pay for MB repair or upgrade system

[e143slime8]

Currently have the following system:

MB: ASUS P8Z77 WS
Processor: Core I7 3770K
4 sticks of Corsair CMZ32G X 3M4 X1600c10
Video card: EVGA e-GeForce 9800 GTX 512 ram
Currently have all 8 on board SATA's occupied, 6 of them with Hard drives (mostly used for video processing, always on as a server and some games played as well).

MB is suspect and is currently with ASUS for diagnosing problem (system build from March 2013).

Question I have is, should I spend probably $300 for repair or just go with new system and try to sell off the parts from original system?

I have been looking at following parts:

Processor
Intel Core i7-6800K 3.4GHz 6-Core $409.99

Motherboard
Asus X99-A II ATX LGA2011-3 Motherboard $223.88

Memory
2 sets of X Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory $93.99 each set

Video Card
MSI GeForce GTX 1070 8GB Video Card

Is there a vast improvement from my old build to new prospective build?

 

[CountMike]

300 bucks for repair ??? You should be able to find an used one for 1/4 of that price but that would still be your old system and your plans are for much better one.

 

[CountMike]

300 bucks for repair ??? You should be able to find an used one for 1/4 of that price but that would still be your old system and your plan B is for much better one.

 

[e143slime8]

Cheapest I could find with a 14 day warranty for that MB is $250.00 on ebay. Have not heard yet from ASUS on their progress so ended up going for the new parts for the upgrade since I am pressed for time needing my machine to be up and running. No sooner do I click "Buy" on Newegg and then they post the I7-7700k processor. Could have cancelled and changed my order but stuck with the 6800k and X99 board. Thanks for the suggestion.