Seeking System Configuration Suggestions

[KorVet]

I would like recommendations for a motherboard & cpu combo that, with my XFX GeForce 9800 GX2 (1GB DDR3), will allow me to run the A10C at one step above the current recommended configuration. I am getting many random freezes now that I did not get before. I suspect my motherboard is the culprit (after many diagnostic attempts using all the net suggestions).

My motherboard is an XFX nForce 790i Ultra and the cpu is an Intel Core Duo E8500. RAM is 4GB Corsair DDR3 1600. Unfortunately that motherboard is no longer available, so I need to get different one. I am not looking to be able to go with super duper kick ass graphics, just enough to run on the "high" setting without snail scale FPS rates. My gaming PC has all the hot stuff, but for the PC running the A10C flight sim I do not think I need the big guns. I wlil be forever grateful for any suggestions y'all may have to offer. Be well and prosper, KorVet.