At this point I am ready to get a new mac mini. My only concern is being able to migrate my old files to the new mini, as I have been told that there may be difficult to migrate from OS 10.4.11 to OS 10.8.2.
Yes...your main issue will be if you have PPC apps. on your old Mac-Mini. Your old Mac-Mini has a PowerPC cpu (PPC)...and apps. written for a PPC cpu are obviously known as "PPC apps.".
The new Mac-Mini's (and all Apple computers since 2006) have Intel cpu's). OS 10.6 was the first OS version that COULD NOT be run on the older PPC-based (computers)...including your current Mac-Mini. But...Apple did include an application with OS 10.6 that allowed users to run PPC apps. on an Intel based Mac called "Rosetta".
OS 10.6 was the last OS version to have Rosetta...and when Apple released OS 10.7...and now OS 10.8...Rosetta was dropped...thus no more running PPC apps. on Mac's running an OS version newer than OS 10.6.
The new Mac-Mini (or any new Mac) will come preinstalled with OS 10.8...so you will not be able to run any PPC apps on a new Mac-Mini. And no...you cannot "downgrade" a new Mac-Mini to run OS 10.6 to regain PPC app. compatibility.
So long story short. If you do not have any older PPC apps. to be concerned about...no problem.
But if you do have lots of expensive older PPC apps. that you do depend on...then if you get a new Mac-Mini...you will either have to upgrade those apps. to a newer version that is compatible with OS 10.8...or lose the use of those apps.
- Nick
p.s. The files that you speak of will probably have no problem being imported with the apps that use those files (on a new Mac-Mini)...but you may need newer versions of those apps to run on a new Mac-Mini running OS 10.8.
For example...if you currently have MS Office 2004 or 2008 installed on your old Mac-Mini (and you needed access to these files on your new Mac-Mini)...you would (for example) need to install MS Office 2011 so that those files could be used with OS 10.8 on your new Mac-Mini.
This is just an example.