Any recommendations for new hardware for RIPE Atlas anchors?

Hi all, we are looking at replacing the hardware of the RIPE Atlas anchors and we would like to hear from you in case you have any suggestions that could help us.
These are the requirements:

• Available worldwide
• A platform with long-term availability
• It can boot from USB
• Min 2GB RAM
• At least 250GB SSD storage
• Min 1 onboard NICs, preferably SFP+ capable
• Switching power supply 
• 1U high rack mountable chassis
• No moving parts
• Price for the host should be under 500 Euros (the cheaper the better) 
• Very nice to have: no separate components but one unit that has it all!