These guys are awesome, and nothing but positive reviews all around. They have hosting for US and UK. Cheapest, and most reliable servers I've ever had.
I can see immediately that I can not join this server from outside of hamachi.
First indicator is the IP. Anything Hamachi related has 5 as the first quarter of the address. As long as the IP is 5.*.*.*, Nobody outside of Hamachi can join it.
No offense, but if WorldGuard is hard for some of your moderators.. they need to get some flash cards or something. All the documentation is ingame, using ingame commands. Not to mention that the time you take finding someone to code this plugin of yours, they could be better familiarizing themselves with WorldGuard's region commands and flags.
First question: Yes, you are able to host the server software on OSX. Second question: No, I doubt there would be a version of multiplayer without using the server software.
Uh.. 8 bucks a month for 4 slots? Are you kidding me? I suggest you trust redjello with this one and check out MPServ. Not to mention with MPServ, you can get a 768MB Server (Recommended 10-15 slots) for only $15.49 USD. But using the coupon "10%OFFLIFE", you can get 10% off of any server, making the price only $13.94 USD.
I'm seeing some red flags here.. You need to clarify some things for me.
1) Which company are you with? 2) What kind of reputation do you have? 3) Would customers have FTP/SSH access? Control panel?
Basically, what can you offer to beat out our current host, MPServ?
Keep in mind that for $90 USD/month, we have: *24/7 support through Phone/Skype *Dedicated Server with: 8GB Ram + Dual Core processor *100mbps guaranteed *250GB Hard Drive
They're hands down,the cheapest out there (And can get cheaper by using the coupon "10%OFFLIFE".) As well, they have the best live support available. Feel free to ask 'em questions left and right to make sure you're getting what you need.