You can check out what has been added by going through the What's New Guides that Ricky Jordan has compiled here:
You may want to wait for SW2013, depending on what kind of work you do.
This may be a hard sell for you. If they are able to function with a version that is now 8 versions old it doesn't sound like they would be willing to put out the money to become current. I.E. All new computers and graphics cards running win 7 for each seat as 2013 doesn't run on XP, plus at this point I am not sure they can just start their subscription service back-up, so that would mean purchasing the software again with subscriptions.
Ask them how much time they spend dimensioning drawings. How much time they spend creating and managing configurations?
Here where I work we started with SW2009, and management intended to skip SW2010. I convinced them that three improvements introduced in SW2010 would save enough time to justify upgrading (the vastly improved Mirror Components function in assemblies, the mid-plane option for creating new planes, and the Select Bodies function for detailing multi-body parts). There have been more improvements since then. And I don't even want to think about having to do without Pack and Go.
I would just explain to them that the increased productivity will justify the cost. The newer version will allow you to get more work done in less time.
Troy mentioned that you will need Win7 to run SW2013, but you don't have to upgrade all the way to SW2013, you could get on SW2012 instead if your hardware won't run SW2013.
Some of the enhancements you get from year to year are simple productivity enhancements which allow you to work faster. Some of the things no one has mentioned are "S" key, mouse gestures, and the instant menus that come up. I would estimate that these and other productivity enhancements allow us to work 1-2% faster every year. So in James' case, a leap in productivity of 10% or more. All you need to do is say to your bosses "Would you like to get 200 more hours out of me this year"?
Also, do you create or work with Large Assemblies?
Here are some assembly statistics from a typical project:
Total Number of Components: 409
Unique Parts: 164
Unique Part Documents: 164
Unique sub-assemblies: 28
Unique sub-assembly documents: 28
Resolved Components: 398
Suppressed Components: 11
Lightweight Components: 0
Number of top level mates: 465
Number of top level components: 183
Number of Bodies: 646
Maximum depth: 4
Note: Components of suppressed sub-assemblies are excluded from these statistics.
Windows 7 is something I hadn't thought about, that might indeed be a very difficult sell as well, although we only really have 3 people running solidworks. Myself, a manufacturing engineer and the outside consultant, however both of them are old timers and both pretty set in their ways...
As an aside, you have a lot top level mates in that assembly, due, no doubt, to the high number of top level parts. SolidWorks would be happier and work faster if you could add some subassemblies to move most of those mates to a lower level. From my reading in these forums, it seems like keeping your top level mates below 100 or so is a good idea.
If selling it to the old timers is your primary problem, I would focus on what they would like to see improved. Talk to them about what they don't like and what seems to take too long, then see if those issues are addressed in one of the newer versions. If you've got a good VAR they will help you with this and give the old codgers a demonstration that will get them on your side.
Jerry Steiger (who is old, but hopes he is not in the way) (making reference to a song that only the old will know)