@Petrigeo Hi there,
Using your metaphor of a house owner, Hifi is a manufacturer and supplier, you still need a plumber, we are all doing our own plumbing.
You need to be looking at a dedicated server on a 1Gbps network.
You also will be looking at Windows because Linux is “almost workable” for a linux geek, if you’re not a linux geek you’d be in for a world of hurt trying to build this thing at every release. Windows is reliable at this stage.
I suggest Windows Server 2008 or 2012 preferably with a good size SSD.
My recent experience has shown a minimum requirement of 16Gig ram if you want 6 concurrent avatars with a reasonable amount of content (textures, models, animations), any more avs than that and you might as well go for 32G. You can get 32G for less than $100 a month.
Try to get a flexible plan and start small. Dont expect more than handful of users to be actually logging in at once.
You could get away with 8Gig and that would see 3 - 4 avatars pretty smooth, audio and voice is where you will see the signs of strain.
Heres a couple of outfits I have used with good results.
I haven’t had experience with Amazon, they have some kind of variable deals and hourly plans I believe.
You’re also going to need a regular webserver to store and deliver the assets, this can be put on the same server but for load balancing its best to be a separate host, which is not using your server bandwidth.
Apart from the monthly hosting/s the only costs are the Hifi “Place Names” which are $20 a year.
Its going to take you hours and days to work all this out.
Ping me if you want some serious help with the Hifi plumbing, I have done this many times before and I am very reasonable, I guess I am the closest thing to a hosting provider that Hifi has got for now.