I have a HP Pavilion Elite m9458fr bought in july 2009 for 416€ (on eBay hp_marketplace_fr). I have no need for beefy GPU. I only need a silent reliable compute

I have a HP Pavilion Elite m9458fr bought in july 2009 for 416€ (on eBay hp_marketplace_fr). I have no need for beefy GPU. I only need a silent reliable computer with a reasonably fast CPU for development on Linux. I would like to replace it in order to have USB3 connectors and SATA III HD. I do not find anything better enough than my actual computer to justify the cost.