Work on what you are interested in. Now you got the chance, once you are employed you have to work with what you are given, it'll happen sometimes you will hate the project.
Glad to see you are thinking ahead!
Only do what you are capable of showing your future employer without having to look in help.
I would do as many simpler projects that include the basic types like but not restricted too:
One FEA, (if you wish)
Get used to someone looking over your shoulder whilst you work, as your employer may want you to show him, (Many get nervous and mess up, even though it is an easy task) to show what you can do.
Most employers want to see that you can do the basics as they will have their own way of doing things. You would be suprised on how many newbies can not even create, let alone insert a block in a drawing.
Learn and show the following as bonus points:-
Drawing specs for your area, ISO, ANSI ect..
How to tolerance assemblies after you have toleranced the parts.
Show surface finish symbols.
Weld symbols (if welding required)
Revision control and why.
Finshes like plating for example
Bend tables if doing sheet metal
A lot depends on what job you are going to be doing, these are just a few, the majority but not all are used when you get the job.
Doing projects is the easy part, relaying the required information to the interested parties is the hardest part.
If you can get your CSWA certification, that goes a long way without needing to show off a portfolio.
The last guy I interviewed that brought in a portfolio did not impress me with it. Most don't bring one, so I have em sit down and model from a drawing. It's a challenging model, most dont get it but I can see the thought process in the feature tree.