Wow, this reads less like freemium and more that they're using enterprise customers to bludgeon innovation out of the market. This new pricing is a pretty big step function, $10 for 10 users, $1,200 for 11 users.
While I like JIRA and have recommended it to many clients, this move is not just to feed the future sales funnel, but attempt to raze competition. Makes me sad for the cool startups (i.e. not Atlassian or Fog Creek) in this area.
I find Confluence a lot nicer than MediaWiki. It's much better organized (organizing pages in Confluence seems built in, MediaWiki's "category" feature seems like an afterthought). Confluence also has useful features for collaboration with things like status updates. I'd give the free trial a go, and compare to see which one works best for you.
We are using Confluence Wiki, Jira Issue Tracking, and Greenhopper for release planning and love it but I can attest even with only a few users Confluence requires more memory than a small 256meg slice can offer. We are on a 512meg slice with Chunkhost and are planning to upgrade to a 1gig slice due to performance issues.
Depends on the number of users. If it is a hobbysite then I'm expecting that you have very little traffic (on the order of a few hundred uniques per day). If you go above that slap some google ads on it, reinvest what you make with those in your server and you'll be doing just fine. By the time you reach $80 / month (and that's only $2.75 / day) you can afford to lease a dedicated server, with as much ram as you care to buy, that's a one time expense.
And you'll still be out only what little bit there is between whatever you make and whatever it costs to get a dedicated server even if you decide to get one from day one.
Hobbies cost money.
edit: hey downmodders, how is your tomcat instance running ? Mine is doing ok:
While I like JIRA and have recommended it to many clients, this move is not just to feed the future sales funnel, but attempt to raze competition. Makes me sad for the cool startups (i.e. not Atlassian or Fog Creek) in this area.