I guess after nine plus years of flawless and most satisfactory performance it may be time to build another unit. My current unit houses a AMD Athlon 64 X2 5400 Brisbane with 16GB RAM. We use the unit for work and surfing, not playing games like teeny-boppers do. What would be a good current model replacement? From there I can spec out mobos, RAM, vid, etc. Thanx.