You can buy a quad core hp t620 thinclient for that. Make sure you search for quad core because they did come in Dual core variants.
Pros: upgradeable, cheaper, standard architecture, comes with everything you need including a power supply, available with a PCI-E slot (Those models are more expensive though)
Cons: bigger than an rpi, no gpio (does have serial port and you can buy USB gpio things), probably uses more power than pi.
For 99% of use cases this is what most people need and not an sbc.