Hello, We have several machines, which are fairly old now. We got them quite cheap. We are wondering what to replace them with in spec, but they are mainly used for surfing the internet or word processing. Any idea whats the next level up from the specification I have shown below? OptiPlex 780 Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz (architecture: x64; 2993 MHz) 3.9 GB RAM Windows 10 We are not looking for a super machine though, can't afford those things, I was told to look for an I7 machine, but they can be quite pricey.