It’s very hard to say just how much your domains are going to go up in value as some end users might see them as more or less valuable than others. Each end user is going to have a different perception on the value of the domain – what’s worth a million bucks to one person might only be worth a few dollars to another.
From my personal experience I’ve noticed that some domains go up in value more than others based on the industry there in. As you can guess, if the industry there in is hot then they’re going to go up in value and if the industry isn’t doing so good there going to go down in value.
As for your domains, to get a rough idea of how the whole market is doing you might want to check the trends in Sedo’s marketplace to get a rough idea of how domains are performing every quarter.