I've got 7.. Ranking the rest of the guys is difficult. Strasburg is obviously a risk and most likely will be taken in the first round (9th overall) once your draft gets underway. I look next to young. (24 and finally broke out, turned 25 in sept). I'd follow him up with Cain (though you could make a case for keeping Cain over Buch as you could likely get Buch in the 10th maybe 11th round vs Cain going 6-8th.) I've been a huge Cain fan over the years and I draft him every year - but he doesn't get the wins and is usually a bad luck loser. After that I have weiters/beckham. Their ADP has them going much later and you could easily acquire them in the draft. Sizemore, Vic, Quentin and Garza are not worth keeping. If you feel you want one of them on your team, go out of your way to reach for them in the draft.
This being said - I'd go with Strasburg... Upside is too great, stash him on the DL and hope he contributes down the stretch but really this pick is for next year.