The x3430 is a QUAD core processor - so this should be just fine. The problem you'll have is the RAM - you NEED more. SBS won't install on less than 4. HyperV REQUIRES (just as any OS) a portion of RAM (I'd suggest AT LEAST 1 GB and be more comfortable with 2 GB) and the Remote Desktop Server will require RAM (given your described usage, AT LEAST 2 GB and I'd be more comfortable with 4 GB. Bottom line, get AT LEAST 12 GB and you should be fine.