Online Game Databases

I am looking for someone who can do databases for online games. As an example of what I'm looking for, check out [login to view URL] and http://rift.zam.com. These will need to be read in using either game files or XML files, but must also have the ability to be added on to manually -- both from the front end and back end, so users can notify admins of incorrect data. Comment enabling would also be nice. The database size will likely be large, as they deal with thousands of different items/skills/enemies/etc. I'd also like ways to log drops (Rift has this natively built in and is exported to XML) so players can also upload their logs and have the data added to the database I'd like other features as well but those are the starting ones. I'm curious as to how much it would cost to have that done, on a per-game basis if possible. If there are any questions, please don't hesitate to ask. Thanks!