Re: Gaining Strength - Just crossfit?
I recommend a strength hybrid program. CrossFit Football's amateur program would be great if you want to maintain conditioning and increase strength. I usually cycle it during the late fall and winter months, but if you want to get stronger, follow it.
The other strength hybrids also work. Just follow it to a tee, and make sure you eat enough.
Edit... CrossFit Football follows a 2-1-3-1 schedule.