You should aim for 3.5 or higher. I am beginning CRNA school in August. You are right, since I only had a little over a year of ICU experience. Definitely getting your CCRN is a plus. GRE is important, so I used 3 review books including one on the top 100 words on the GRE. Also, I think a good thing to do is choosing 4-5 schools to apply to. Have you been on all-crna-schools.com? It has great info. You can do it, just stay motivated and determined.