Best server to start an MMO

Hey everyone,
I'm not sure if this is the right place to post, but I figured research it is I'm doing, so research is where I'll post it :-)

I've been looking into what it takes to develop an MMO (RPG, FPS or Otherwise) other than $$ of course, and being the nature of this forum, I would love your input on what would be the most secure, but not "from scratch" solution is in your opinion.

The security I think is the foremost important aspect to keeping a MMO going, and I'd like to learn more about what server options are available that have provided good use in the past, and what if any guides you could point me to that would help in learning more about the best way to implement a secure MMO server into a Unity developed game. I do plan to purchase Unity Pro and have done a ton of research, and while it's not the ideal solution, I think it should be able to integrate with many different server architecture's out there, so I wanted to know, from a security stand point, if you knew any "out of the box" solutions that would be best to look into implementing as a server side host of both the database, and the socket connections for member's, while managing the connections efficiently and detecting stuff like lag hacks, injections (probably more code security there than server handling it I know), and still allowing enough flexibility to work with a system such as a Unity client / server relationship.

I look forward to any input, kinda new here, so I'll keep digging around for any threads similar,
Thanks!

---------- Post added 2012-06-27 at 10:26 PM ---------- Previous post was 2012-06-26 at 08:04 PM ----------

Hi,
Just after doing some digging, I've seen SmartFox Pro 2x server, which seems good for games like MMORPG and MMOFPS, but it doesn't appear I get much flexibility with the socket connections themselves, it looks like a solution like that is all handled via SmartFox and then I only get API access via C# or AS to make "extensions".

I'm wondering if anyone has any experience with security on SmartFox server based games, if they are a no-go, and why, or if they can be secured properly, and any suggestions would be great!

Thanks!