I haven't ordered the server yet. I'm in the process of getting quotations to get the project approved, so I came here first to look for experienced advice to decide the hardware needed. All your suggestions have been noted and will be included.
Regarding the support, I have managed my VPSs by my own. I only had to contact support once when one of the 2 VPS went offline for about 2 hours and I couldn't even send a reboot to the VPS. Once contacted by email the trouble was solved in less than 10 minutes. The only spot is that they only have in that support is offered from 8 am to 11 pm (UTC+1) via telephone and e-mail, and we are in Central America (UTC-6) so we have a huge difference in working hours, but in 1.5 yeard we had only 1 incident.
I hope the project will be approved soon, and promise to share here my experience to help others.