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That's a very capable system and will do quite well on any project. In addition to the projects mentioned, you might check out
TN-Grid. It's not directly doing medical research now, but is doing genetic research that may benefit that in the future.
Right now GPUGrid is a little bit light on work, and a lot of crunchers have started there in the last couple years so work is harder to get than it used to be. If you aren't getting work that's probably why. There is a limit of two jobs at a time per GPU, so that's the most you will get. It's also one of the more demanding projects, so if your card is overclocked check your work to make sure it's validating. GPUs that are appear stable in other testing can produce invalid work here.
Rosetta has a mix of tasks with different job deadlines, some as low as three days, so I suggest you set your cache (found in the manager under Options -> Computing Preferences -> Other [Store at least N days of work]) to no more than a day to start off with. This is especially important if you aren't running that machine 24/7. A low cache isn't foolproof, but it helps make sure you don't have more work than you can complete in time.
If you have any problems, just let us know.